commit a95badb6a29e37cd995792d3759db5fe19d1c047
Author: Christoph Moench-Tegeder <cmt@FreeBSD.org>

    regenerate FreeBSD libwebrtc patch for gecko 159

diff --git third_party/libwebrtc/api/adaptation/resource_adaptation_api_gn/moz.build third_party/libwebrtc/api/adaptation/resource_adaptation_api_gn/moz.build
index 847afd5241f6..a97399cd3908 100644
--- third_party/libwebrtc/api/adaptation/resource_adaptation_api_gn/moz.build
+++ third_party/libwebrtc/api/adaptation/resource_adaptation_api_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("resource_adaptation_api_gn")
diff --git third_party/libwebrtc/api/async_dns_resolver_gn/moz.build third_party/libwebrtc/api/async_dns_resolver_gn/moz.build
index 7056a52e9913..79c8b4501f51 100644
--- third_party/libwebrtc/api/async_dns_resolver_gn/moz.build
+++ third_party/libwebrtc/api/async_dns_resolver_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,93 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "GLESv2",
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -138,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -166,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("async_dns_resolver_gn")
diff --git third_party/libwebrtc/api/audio/aec3_config_gn/moz.build third_party/libwebrtc/api/audio/aec3_config_gn/moz.build
index 26a23d13ea35..3bd676611493 100644
--- third_party/libwebrtc/api/audio/aec3_config_gn/moz.build
+++ third_party/libwebrtc/api/audio/aec3_config_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("aec3_config_gn")
diff --git third_party/libwebrtc/api/audio/aec3_factory_gn/moz.build third_party/libwebrtc/api/audio/aec3_factory_gn/moz.build
index 029a10fcc267..c02f037a34ea 100644
--- third_party/libwebrtc/api/audio/aec3_factory_gn/moz.build
+++ third_party/libwebrtc/api/audio/aec3_factory_gn/moz.build
@@ -13,15 +13,24 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
 DEFINES["WEBRTC_APM_DEBUG_DUMP"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -49,97 +58,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -147,82 +66,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("aec3_factory_gn")
diff --git third_party/libwebrtc/api/audio/audio_device_gn/moz.build third_party/libwebrtc/api/audio/audio_device_gn/moz.build
index cc4af9a2b41a..5a937aac3f8d 100644
--- third_party/libwebrtc/api/audio/audio_device_gn/moz.build
+++ third_party/libwebrtc/api/audio/audio_device_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,86 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -159,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("audio_device_gn")
diff --git third_party/libwebrtc/api/audio/audio_frame_api_gn/moz.build third_party/libwebrtc/api/audio/audio_frame_api_gn/moz.build
index d12d158e8041..669d52998476 100644
--- third_party/libwebrtc/api/audio/audio_frame_api_gn/moz.build
+++ third_party/libwebrtc/api/audio/audio_frame_api_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -49,97 +58,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -147,82 +66,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("audio_frame_api_gn")
diff --git third_party/libwebrtc/api/audio/audio_frame_processor_gn/moz.build third_party/libwebrtc/api/audio/audio_frame_processor_gn/moz.build
index a10eed44568a..8c720b784a87 100644
--- third_party/libwebrtc/api/audio/audio_frame_processor_gn/moz.build
+++ third_party/libwebrtc/api/audio/audio_frame_processor_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("audio_frame_processor_gn")
diff --git third_party/libwebrtc/api/audio/audio_mixer_api_gn/moz.build third_party/libwebrtc/api/audio/audio_mixer_api_gn/moz.build
index 65f18e16aada..830ba0ff839a 100644
--- third_party/libwebrtc/api/audio/audio_mixer_api_gn/moz.build
+++ third_party/libwebrtc/api/audio/audio_mixer_api_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,97 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -170,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("audio_mixer_api_gn")
diff --git third_party/libwebrtc/api/audio/audio_processing_gn/moz.build third_party/libwebrtc/api/audio/audio_processing_gn/moz.build
index 48dc8ce1668f..f1bf39ca62a9 100644
--- third_party/libwebrtc/api/audio/audio_processing_gn/moz.build
+++ third_party/libwebrtc/api/audio/audio_processing_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("audio_processing_gn")
diff --git third_party/libwebrtc/api/audio/audio_processing_statistics_gn/moz.build third_party/libwebrtc/api/audio/audio_processing_statistics_gn/moz.build
index 0bd63f3362ba..7462be328971 100644
--- third_party/libwebrtc/api/audio/audio_processing_statistics_gn/moz.build
+++ third_party/libwebrtc/api/audio/audio_processing_statistics_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,82 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("audio_processing_statistics_gn")
diff --git third_party/libwebrtc/api/audio/builtin_audio_processing_builder_gn/moz.build third_party/libwebrtc/api/audio/builtin_audio_processing_builder_gn/moz.build
index 44fcf1f20888..8db091d52b93 100644
--- third_party/libwebrtc/api/audio/builtin_audio_processing_builder_gn/moz.build
+++ third_party/libwebrtc/api/audio/builtin_audio_processing_builder_gn/moz.build
@@ -13,15 +13,24 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
 DEFINES["WEBRTC_APM_DEBUG_DUMP"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -49,97 +58,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -147,82 +66,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("builtin_audio_processing_builder_gn")
diff --git third_party/libwebrtc/api/audio/echo_control_gn/moz.build third_party/libwebrtc/api/audio/echo_control_gn/moz.build
index 4229f7bd872c..96ecbed96914 100644
--- third_party/libwebrtc/api/audio/echo_control_gn/moz.build
+++ third_party/libwebrtc/api/audio/echo_control_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,97 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -170,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("echo_control_gn")
diff --git third_party/libwebrtc/api/audio/neural_residual_echo_estimator_api_gn/moz.build third_party/libwebrtc/api/audio/neural_residual_echo_estimator_api_gn/moz.build
index 183071ee9bc3..c0acf75bfeba 100644
--- third_party/libwebrtc/api/audio/neural_residual_echo_estimator_api_gn/moz.build
+++ third_party/libwebrtc/api/audio/neural_residual_echo_estimator_api_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,86 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -159,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("neural_residual_echo_estimator_api_gn")
diff --git third_party/libwebrtc/api/audio_codecs/L16/audio_decoder_L16_gn/moz.build third_party/libwebrtc/api/audio_codecs/L16/audio_decoder_L16_gn/moz.build
index 0c40d2eaf7f4..3f6ec0be344c 100644
--- third_party/libwebrtc/api/audio_codecs/L16/audio_decoder_L16_gn/moz.build
+++ third_party/libwebrtc/api/audio_codecs/L16/audio_decoder_L16_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("audio_decoder_L16_gn")
diff --git third_party/libwebrtc/api/audio_codecs/L16/audio_encoder_L16_gn/moz.build third_party/libwebrtc/api/audio_codecs/L16/audio_encoder_L16_gn/moz.build
index 6541cb619ba5..0169739f3d33 100644
--- third_party/libwebrtc/api/audio_codecs/L16/audio_encoder_L16_gn/moz.build
+++ third_party/libwebrtc/api/audio_codecs/L16/audio_encoder_L16_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("audio_encoder_L16_gn")
diff --git third_party/libwebrtc/api/audio_codecs/audio_codecs_api_gn/moz.build third_party/libwebrtc/api/audio_codecs/audio_codecs_api_gn/moz.build
index dfb10d60b32f..7a9266c1503d 100644
--- third_party/libwebrtc/api/audio_codecs/audio_codecs_api_gn/moz.build
+++ third_party/libwebrtc/api/audio_codecs/audio_codecs_api_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -51,97 +60,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -149,82 +68,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("audio_codecs_api_gn")
diff --git third_party/libwebrtc/api/audio_codecs/builtin_audio_decoder_factory_gn/moz.build third_party/libwebrtc/api/audio_codecs/builtin_audio_decoder_factory_gn/moz.build
index 0804f23805bd..97d645d9a375 100644
--- third_party/libwebrtc/api/audio_codecs/builtin_audio_decoder_factory_gn/moz.build
+++ third_party/libwebrtc/api/audio_codecs/builtin_audio_decoder_factory_gn/moz.build
@@ -13,15 +13,24 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_USE_BUILTIN_OPUS"] = "1"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -49,97 +58,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -147,82 +66,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("builtin_audio_decoder_factory_gn")
diff --git third_party/libwebrtc/api/audio_codecs/builtin_audio_encoder_factory_gn/moz.build third_party/libwebrtc/api/audio_codecs/builtin_audio_encoder_factory_gn/moz.build
index 6552256fa34b..eea4765f5e1f 100644
--- third_party/libwebrtc/api/audio_codecs/builtin_audio_encoder_factory_gn/moz.build
+++ third_party/libwebrtc/api/audio_codecs/builtin_audio_encoder_factory_gn/moz.build
@@ -13,15 +13,24 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_USE_BUILTIN_OPUS"] = "1"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -49,97 +58,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -147,82 +66,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("builtin_audio_encoder_factory_gn")
diff --git third_party/libwebrtc/api/audio_codecs/g711/audio_decoder_g711_gn/moz.build third_party/libwebrtc/api/audio_codecs/g711/audio_decoder_g711_gn/moz.build
index 98b10f9fa01a..814e22993bcf 100644
--- third_party/libwebrtc/api/audio_codecs/g711/audio_decoder_g711_gn/moz.build
+++ third_party/libwebrtc/api/audio_codecs/g711/audio_decoder_g711_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("audio_decoder_g711_gn")
diff --git third_party/libwebrtc/api/audio_codecs/g711/audio_encoder_g711_gn/moz.build third_party/libwebrtc/api/audio_codecs/g711/audio_encoder_g711_gn/moz.build
index c5a0e69c0690..54613320b3fd 100644
--- third_party/libwebrtc/api/audio_codecs/g711/audio_encoder_g711_gn/moz.build
+++ third_party/libwebrtc/api/audio_codecs/g711/audio_encoder_g711_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("audio_encoder_g711_gn")
diff --git third_party/libwebrtc/api/audio_codecs/g722/audio_decoder_g722_gn/moz.build third_party/libwebrtc/api/audio_codecs/g722/audio_decoder_g722_gn/moz.build
index 700089cc2c44..977f5492ad30 100644
--- third_party/libwebrtc/api/audio_codecs/g722/audio_decoder_g722_gn/moz.build
+++ third_party/libwebrtc/api/audio_codecs/g722/audio_decoder_g722_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("audio_decoder_g722_gn")
diff --git third_party/libwebrtc/api/audio_codecs/g722/audio_encoder_g722_config_gn/moz.build third_party/libwebrtc/api/audio_codecs/g722/audio_encoder_g722_config_gn/moz.build
index ff9ed7aa33cf..d85daaf2b14d 100644
--- third_party/libwebrtc/api/audio_codecs/g722/audio_encoder_g722_config_gn/moz.build
+++ third_party/libwebrtc/api/audio_codecs/g722/audio_encoder_g722_config_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,97 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -170,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("audio_encoder_g722_config_gn")
diff --git third_party/libwebrtc/api/audio_codecs/g722/audio_encoder_g722_gn/moz.build third_party/libwebrtc/api/audio_codecs/g722/audio_encoder_g722_gn/moz.build
index 03a0cc46c8d3..44fef7555135 100644
--- third_party/libwebrtc/api/audio_codecs/g722/audio_encoder_g722_gn/moz.build
+++ third_party/libwebrtc/api/audio_codecs/g722/audio_encoder_g722_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("audio_encoder_g722_gn")
diff --git third_party/libwebrtc/api/audio_codecs/opus/audio_decoder_multiopus_gn/moz.build third_party/libwebrtc/api/audio_codecs/opus/audio_decoder_multiopus_gn/moz.build
index 3befdc774f7b..e5fb502db4a9 100644
--- third_party/libwebrtc/api/audio_codecs/opus/audio_decoder_multiopus_gn/moz.build
+++ third_party/libwebrtc/api/audio_codecs/opus/audio_decoder_multiopus_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -49,97 +58,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -147,82 +66,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("audio_decoder_multiopus_gn")
diff --git third_party/libwebrtc/api/audio_codecs/opus/audio_decoder_opus_config_gn/moz.build third_party/libwebrtc/api/audio_codecs/opus/audio_decoder_opus_config_gn/moz.build
index 3550f593eaa2..1bea1e05007a 100644
--- third_party/libwebrtc/api/audio_codecs/opus/audio_decoder_opus_config_gn/moz.build
+++ third_party/libwebrtc/api/audio_codecs/opus/audio_decoder_opus_config_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,97 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -170,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("audio_decoder_opus_config_gn")
diff --git third_party/libwebrtc/api/audio_codecs/opus/audio_decoder_opus_gn/moz.build third_party/libwebrtc/api/audio_codecs/opus/audio_decoder_opus_gn/moz.build
index daa9a578c096..8ecd8053228c 100644
--- third_party/libwebrtc/api/audio_codecs/opus/audio_decoder_opus_gn/moz.build
+++ third_party/libwebrtc/api/audio_codecs/opus/audio_decoder_opus_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -49,97 +58,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -147,82 +66,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("audio_decoder_opus_gn")
diff --git third_party/libwebrtc/api/audio_codecs/opus/audio_encoder_multiopus_gn/moz.build third_party/libwebrtc/api/audio_codecs/opus/audio_encoder_multiopus_gn/moz.build
index dce8285d66ad..749a13f82dbb 100644
--- third_party/libwebrtc/api/audio_codecs/opus/audio_encoder_multiopus_gn/moz.build
+++ third_party/libwebrtc/api/audio_codecs/opus/audio_encoder_multiopus_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -49,97 +58,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -147,82 +66,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("audio_encoder_multiopus_gn")
diff --git third_party/libwebrtc/api/audio_codecs/opus/audio_encoder_opus_config_gn/moz.build third_party/libwebrtc/api/audio_codecs/opus/audio_encoder_opus_config_gn/moz.build
index 1c95f122b58e..678427d8bc07 100644
--- third_party/libwebrtc/api/audio_codecs/opus/audio_encoder_opus_config_gn/moz.build
+++ third_party/libwebrtc/api/audio_codecs/opus/audio_encoder_opus_config_gn/moz.build
@@ -13,6 +13,9 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
@@ -20,8 +23,14 @@ DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
 DEFINES["WEBRTC_OPUS_VARIABLE_COMPLEXITY"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -53,97 +62,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -151,82 +70,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("audio_encoder_opus_config_gn")
diff --git third_party/libwebrtc/api/audio_codecs/opus/audio_encoder_opus_gn/moz.build third_party/libwebrtc/api/audio_codecs/opus/audio_encoder_opus_gn/moz.build
index 95931af84828..da212bd3c1a7 100644
--- third_party/libwebrtc/api/audio_codecs/opus/audio_encoder_opus_gn/moz.build
+++ third_party/libwebrtc/api/audio_codecs/opus/audio_encoder_opus_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -49,97 +58,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -147,82 +66,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("audio_encoder_opus_gn")
diff --git third_party/libwebrtc/api/audio_codecs/opus_audio_decoder_factory_gn/moz.build third_party/libwebrtc/api/audio_codecs/opus_audio_decoder_factory_gn/moz.build
index 3e9a3a9585c0..6e541a612cf1 100644
--- third_party/libwebrtc/api/audio_codecs/opus_audio_decoder_factory_gn/moz.build
+++ third_party/libwebrtc/api/audio_codecs/opus_audio_decoder_factory_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("opus_audio_decoder_factory_gn")
diff --git third_party/libwebrtc/api/audio_options_api_gn/moz.build third_party/libwebrtc/api/audio_options_api_gn/moz.build
index d632657b6f15..2f936aba0cfa 100644
--- third_party/libwebrtc/api/audio_options_api_gn/moz.build
+++ third_party/libwebrtc/api/audio_options_api_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("audio_options_api_gn")
diff --git third_party/libwebrtc/api/bitrate_allocation_gn/moz.build third_party/libwebrtc/api/bitrate_allocation_gn/moz.build
index 774989192faa..9107b335c3bb 100644
--- third_party/libwebrtc/api/bitrate_allocation_gn/moz.build
+++ third_party/libwebrtc/api/bitrate_allocation_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,86 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -159,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("bitrate_allocation_gn")
diff --git third_party/libwebrtc/api/call_api_gn/moz.build third_party/libwebrtc/api/call_api_gn/moz.build
index 792ccd2f6ed7..f55999f56b1c 100644
--- third_party/libwebrtc/api/call_api_gn/moz.build
+++ third_party/libwebrtc/api/call_api_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("call_api_gn")
diff --git third_party/libwebrtc/api/crypto/frame_decryptor_interface_gn/moz.build third_party/libwebrtc/api/crypto/frame_decryptor_interface_gn/moz.build
index 334773473440..4c123000a2dc 100644
--- third_party/libwebrtc/api/crypto/frame_decryptor_interface_gn/moz.build
+++ third_party/libwebrtc/api/crypto/frame_decryptor_interface_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,97 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -170,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("frame_decryptor_interface_gn")
diff --git third_party/libwebrtc/api/crypto/frame_encryptor_interface_gn/moz.build third_party/libwebrtc/api/crypto/frame_encryptor_interface_gn/moz.build
index ed7d3c1f041e..a907d73fcb00 100644
--- third_party/libwebrtc/api/crypto/frame_encryptor_interface_gn/moz.build
+++ third_party/libwebrtc/api/crypto/frame_encryptor_interface_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,97 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -170,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("frame_encryptor_interface_gn")
diff --git third_party/libwebrtc/api/crypto/options_gn/moz.build third_party/libwebrtc/api/crypto/options_gn/moz.build
index bf52f484c9e5..80f48e3c52bb 100644
--- third_party/libwebrtc/api/crypto/options_gn/moz.build
+++ third_party/libwebrtc/api/crypto/options_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("options_gn")
diff --git third_party/libwebrtc/api/environment/deprecated_global_field_trials_gn/moz.build third_party/libwebrtc/api/environment/deprecated_global_field_trials_gn/moz.build
index 74a28ca1cbdb..192b7f9816ee 100644
--- third_party/libwebrtc/api/environment/deprecated_global_field_trials_gn/moz.build
+++ third_party/libwebrtc/api/environment/deprecated_global_field_trials_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("deprecated_global_field_trials_gn")
diff --git third_party/libwebrtc/api/environment/environment_factory_gn/moz.build third_party/libwebrtc/api/environment/environment_factory_gn/moz.build
index 0fc7651668d3..4ace30db8f43 100644
--- third_party/libwebrtc/api/environment/environment_factory_gn/moz.build
+++ third_party/libwebrtc/api/environment/environment_factory_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("environment_factory_gn")
diff --git third_party/libwebrtc/api/environment/environment_gn/moz.build third_party/libwebrtc/api/environment/environment_gn/moz.build
index 44429f595498..98996093b65d 100644
--- third_party/libwebrtc/api/environment/environment_gn/moz.build
+++ third_party/libwebrtc/api/environment/environment_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,97 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -170,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("environment_gn")
diff --git third_party/libwebrtc/api/environment/force_test_environment_gn/moz.build third_party/libwebrtc/api/environment/force_test_environment_gn/moz.build
index 92d9362aae92..b83a822a23b2 100644
--- third_party/libwebrtc/api/environment/force_test_environment_gn/moz.build
+++ third_party/libwebrtc/api/environment/force_test_environment_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,82 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("force_test_environment_gn")
diff --git third_party/libwebrtc/api/fec_controller_api_gn/moz.build third_party/libwebrtc/api/fec_controller_api_gn/moz.build
index 7b329ec257ae..b6af6ad8b5e0 100644
--- third_party/libwebrtc/api/fec_controller_api_gn/moz.build
+++ third_party/libwebrtc/api/fec_controller_api_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,97 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -170,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("fec_controller_api_gn")
diff --git third_party/libwebrtc/api/field_trials_registry_gn/moz.build third_party/libwebrtc/api/field_trials_registry_gn/moz.build
index 71e0f979e3f3..52a14ef4a0b4 100644
--- third_party/libwebrtc/api/field_trials_registry_gn/moz.build
+++ third_party/libwebrtc/api/field_trials_registry_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("field_trials_registry_gn")
diff --git third_party/libwebrtc/api/field_trials_view_gn/moz.build third_party/libwebrtc/api/field_trials_view_gn/moz.build
index 1a40b109d916..37b3c6ff0dc2 100644
--- third_party/libwebrtc/api/field_trials_view_gn/moz.build
+++ third_party/libwebrtc/api/field_trials_view_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,86 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -159,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("field_trials_view_gn")
diff --git third_party/libwebrtc/api/frame_transformer_factory_gn/moz.build third_party/libwebrtc/api/frame_transformer_factory_gn/moz.build
index 2ddfd71b8a6c..da957d7c9971 100644
--- third_party/libwebrtc/api/frame_transformer_factory_gn/moz.build
+++ third_party/libwebrtc/api/frame_transformer_factory_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,98 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "GLESv2",
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -147,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("frame_transformer_factory_gn")
diff --git third_party/libwebrtc/api/frame_transformer_interface_gn/moz.build third_party/libwebrtc/api/frame_transformer_interface_gn/moz.build
index aff6021584f9..93ddcffc0716 100644
--- third_party/libwebrtc/api/frame_transformer_interface_gn/moz.build
+++ third_party/libwebrtc/api/frame_transformer_interface_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("frame_transformer_interface_gn")
diff --git third_party/libwebrtc/api/function_view_gn/moz.build third_party/libwebrtc/api/function_view_gn/moz.build
index 3707989adac3..bf827c5c201b 100644
--- third_party/libwebrtc/api/function_view_gn/moz.build
+++ third_party/libwebrtc/api/function_view_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,86 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -159,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("function_view_gn")
diff --git third_party/libwebrtc/api/libjingle_logging_api_gn/moz.build third_party/libwebrtc/api/libjingle_logging_api_gn/moz.build
index b79df6e5e198..9524b221791c 100644
--- third_party/libwebrtc/api/libjingle_logging_api_gn/moz.build
+++ third_party/libwebrtc/api/libjingle_logging_api_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("jingle_logging_api_gn")
diff --git third_party/libwebrtc/api/location_gn/moz.build third_party/libwebrtc/api/location_gn/moz.build
index 58d0ebab2040..8a01b61e81bf 100644
--- third_party/libwebrtc/api/location_gn/moz.build
+++ third_party/libwebrtc/api/location_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("location_gn")
diff --git third_party/libwebrtc/api/make_ref_counted_gn/moz.build third_party/libwebrtc/api/make_ref_counted_gn/moz.build
index 16010087a179..64b22c32dc3e 100644
--- third_party/libwebrtc/api/make_ref_counted_gn/moz.build
+++ third_party/libwebrtc/api/make_ref_counted_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,86 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -159,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("make_ref_counted_gn")
diff --git third_party/libwebrtc/api/media_stream_interface_gn/moz.build third_party/libwebrtc/api/media_stream_interface_gn/moz.build
index 2f873421a205..89669e8601f0 100644
--- third_party/libwebrtc/api/media_stream_interface_gn/moz.build
+++ third_party/libwebrtc/api/media_stream_interface_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("media_stream_interface_gn")
diff --git third_party/libwebrtc/api/metronome/metronome_gn/moz.build third_party/libwebrtc/api/metronome/metronome_gn/moz.build
index 838d19036d0b..f5fc376f42a9 100644
--- third_party/libwebrtc/api/metronome/metronome_gn/moz.build
+++ third_party/libwebrtc/api/metronome/metronome_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,86 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -159,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("metronome_gn")
diff --git third_party/libwebrtc/api/neteq/default_neteq_controller_factory_gn/moz.build third_party/libwebrtc/api/neteq/default_neteq_controller_factory_gn/moz.build
index 10c22e96b89c..e7afb4667bba 100644
--- third_party/libwebrtc/api/neteq/default_neteq_controller_factory_gn/moz.build
+++ third_party/libwebrtc/api/neteq/default_neteq_controller_factory_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("default_neteq_controller_factory_gn")
diff --git third_party/libwebrtc/api/neteq/default_neteq_factory_gn/moz.build third_party/libwebrtc/api/neteq/default_neteq_factory_gn/moz.build
index e8e1b4f60db2..8dc4c609eb01 100644
--- third_party/libwebrtc/api/neteq/default_neteq_factory_gn/moz.build
+++ third_party/libwebrtc/api/neteq/default_neteq_factory_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("default_neteq_factory_gn")
diff --git third_party/libwebrtc/api/neteq/delay_manager_api_gn/moz.build third_party/libwebrtc/api/neteq/delay_manager_api_gn/moz.build
index 5eba7cd40665..ab8425e08159 100644
--- third_party/libwebrtc/api/neteq/delay_manager_api_gn/moz.build
+++ third_party/libwebrtc/api/neteq/delay_manager_api_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,97 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -170,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("delay_manager_api_gn")
diff --git third_party/libwebrtc/api/neteq/neteq_api_gn/moz.build third_party/libwebrtc/api/neteq/neteq_api_gn/moz.build
index 35cafc9d6d1a..6a56bc4d2bb1 100644
--- third_party/libwebrtc/api/neteq/neteq_api_gn/moz.build
+++ third_party/libwebrtc/api/neteq/neteq_api_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("neteq_api_gn")
diff --git third_party/libwebrtc/api/neteq/neteq_controller_api_gn/moz.build third_party/libwebrtc/api/neteq/neteq_controller_api_gn/moz.build
index 08a6bccb8e0c..4a08148bbbe5 100644
--- third_party/libwebrtc/api/neteq/neteq_controller_api_gn/moz.build
+++ third_party/libwebrtc/api/neteq/neteq_controller_api_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,97 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -170,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("neteq_controller_api_gn")
diff --git third_party/libwebrtc/api/neteq/tick_timer_gn/moz.build third_party/libwebrtc/api/neteq/tick_timer_gn/moz.build
index 440189b78caa..a71d623b1a66 100644
--- third_party/libwebrtc/api/neteq/tick_timer_gn/moz.build
+++ third_party/libwebrtc/api/neteq/tick_timer_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("tick_timer_gn")
diff --git third_party/libwebrtc/api/network_state_predictor_api_gn/moz.build third_party/libwebrtc/api/network_state_predictor_api_gn/moz.build
index 479d2daf5bf2..99404f12549d 100644
--- third_party/libwebrtc/api/network_state_predictor_api_gn/moz.build
+++ third_party/libwebrtc/api/network_state_predictor_api_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("network_state_predictor_api_gn")
diff --git third_party/libwebrtc/api/payload_type_gn/moz.build third_party/libwebrtc/api/payload_type_gn/moz.build
index 3896c4f47e7f..b7367d42a6d0 100644
--- third_party/libwebrtc/api/payload_type_gn/moz.build
+++ third_party/libwebrtc/api/payload_type_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("payload_type_gn")
diff --git third_party/libwebrtc/api/priority_gn/moz.build third_party/libwebrtc/api/priority_gn/moz.build
index 35574ca9459e..64140ffc75fc 100644
--- third_party/libwebrtc/api/priority_gn/moz.build
+++ third_party/libwebrtc/api/priority_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("priority_gn")
diff --git third_party/libwebrtc/api/ref_count_gn/moz.build third_party/libwebrtc/api/ref_count_gn/moz.build
index bb4d048812ee..9136a5a5d039 100644
--- third_party/libwebrtc/api/ref_count_gn/moz.build
+++ third_party/libwebrtc/api/ref_count_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("ref_count_gn")
diff --git third_party/libwebrtc/api/refcountedbase_gn/moz.build third_party/libwebrtc/api/refcountedbase_gn/moz.build
index 45f62eeb29c2..588c167ac720 100644
--- third_party/libwebrtc/api/refcountedbase_gn/moz.build
+++ third_party/libwebrtc/api/refcountedbase_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,86 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -159,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("refcountedbase_gn")
diff --git third_party/libwebrtc/api/rtc_error_gn/moz.build third_party/libwebrtc/api/rtc_error_gn/moz.build
index e1a511be2f79..e0647d96c2d3 100644
--- third_party/libwebrtc/api/rtc_error_gn/moz.build
+++ third_party/libwebrtc/api/rtc_error_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("rtc_error_gn")
diff --git third_party/libwebrtc/api/rtc_event_log/rtc_event_log_gn/moz.build third_party/libwebrtc/api/rtc_event_log/rtc_event_log_gn/moz.build
index c94858b81ad1..23fed9576528 100644
--- third_party/libwebrtc/api/rtc_event_log/rtc_event_log_gn/moz.build
+++ third_party/libwebrtc/api/rtc_event_log/rtc_event_log_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("rtc_event_log_gn")
diff --git third_party/libwebrtc/api/rtp_header_extension_id_gn/moz.build third_party/libwebrtc/api/rtp_header_extension_id_gn/moz.build
index 693ba2464c21..b3ea15c5bb3c 100644
--- third_party/libwebrtc/api/rtp_header_extension_id_gn/moz.build
+++ third_party/libwebrtc/api/rtp_header_extension_id_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,86 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -159,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("rtp_header_extension_id_gn")
diff --git third_party/libwebrtc/api/rtp_headers_gn/moz.build third_party/libwebrtc/api/rtp_headers_gn/moz.build
index 8b4e67ddf574..50996fada328 100644
--- third_party/libwebrtc/api/rtp_headers_gn/moz.build
+++ third_party/libwebrtc/api/rtp_headers_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("rtp_headers_gn")
diff --git third_party/libwebrtc/api/rtp_packet_info_gn/moz.build third_party/libwebrtc/api/rtp_packet_info_gn/moz.build
index 2ecc707067b6..f9d644abd161 100644
--- third_party/libwebrtc/api/rtp_packet_info_gn/moz.build
+++ third_party/libwebrtc/api/rtp_packet_info_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("rtp_packet_info_gn")
diff --git third_party/libwebrtc/api/rtp_packet_sender_gn/moz.build third_party/libwebrtc/api/rtp_packet_sender_gn/moz.build
index dfcd6d076da2..d52fbe9d5847 100644
--- third_party/libwebrtc/api/rtp_packet_sender_gn/moz.build
+++ third_party/libwebrtc/api/rtp_packet_sender_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("rtp_packet_sender_gn")
diff --git third_party/libwebrtc/api/rtp_parameters_gn/moz.build third_party/libwebrtc/api/rtp_parameters_gn/moz.build
index 2bd0bf2b3188..efe4266c8285 100644
--- third_party/libwebrtc/api/rtp_parameters_gn/moz.build
+++ third_party/libwebrtc/api/rtp_parameters_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -49,97 +58,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -147,82 +66,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("rtp_parameters_gn")
diff --git third_party/libwebrtc/api/rtp_sender_interface_gn/moz.build third_party/libwebrtc/api/rtp_sender_interface_gn/moz.build
index 18a10aa86afc..53296f441bd0 100644
--- third_party/libwebrtc/api/rtp_sender_interface_gn/moz.build
+++ third_party/libwebrtc/api/rtp_sender_interface_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("rtp_sender_interface_gn")
diff --git third_party/libwebrtc/api/rtp_sender_setparameters_callback_gn/moz.build third_party/libwebrtc/api/rtp_sender_setparameters_callback_gn/moz.build
index 48a26033ba92..4ba90b9897d3 100644
--- third_party/libwebrtc/api/rtp_sender_setparameters_callback_gn/moz.build
+++ third_party/libwebrtc/api/rtp_sender_setparameters_callback_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("rtp_sender_setparameters_callback_gn")
diff --git third_party/libwebrtc/api/rtp_transceiver_direction_gn/moz.build third_party/libwebrtc/api/rtp_transceiver_direction_gn/moz.build
index 275937ac5800..c0f4ca43d03a 100644
--- third_party/libwebrtc/api/rtp_transceiver_direction_gn/moz.build
+++ third_party/libwebrtc/api/rtp_transceiver_direction_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("rtp_transceiver_direction_gn")
diff --git third_party/libwebrtc/api/scoped_refptr_gn/moz.build third_party/libwebrtc/api/scoped_refptr_gn/moz.build
index 8e55ab5633da..884f3ea2ca33 100644
--- third_party/libwebrtc/api/scoped_refptr_gn/moz.build
+++ third_party/libwebrtc/api/scoped_refptr_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("scoped_refptr_gn")
diff --git third_party/libwebrtc/api/sequence_checker_gn/moz.build third_party/libwebrtc/api/sequence_checker_gn/moz.build
index 5f63ecc04163..8ca9cae5af25 100644
--- third_party/libwebrtc/api/sequence_checker_gn/moz.build
+++ third_party/libwebrtc/api/sequence_checker_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,86 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -159,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("sequence_checker_gn")
diff --git third_party/libwebrtc/api/task_queue/default_task_queue_factory_gn/moz.build third_party/libwebrtc/api/task_queue/default_task_queue_factory_gn/moz.build
index ed096f9f3932..88880226e110 100644
--- third_party/libwebrtc/api/task_queue/default_task_queue_factory_gn/moz.build
+++ third_party/libwebrtc/api/task_queue/default_task_queue_factory_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("default_task_queue_factory_gn")
diff --git third_party/libwebrtc/api/task_queue/pending_task_safety_flag_gn/moz.build third_party/libwebrtc/api/task_queue/pending_task_safety_flag_gn/moz.build
index 5d1afaf563ce..9a884250af15 100644
--- third_party/libwebrtc/api/task_queue/pending_task_safety_flag_gn/moz.build
+++ third_party/libwebrtc/api/task_queue/pending_task_safety_flag_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("pending_task_safety_flag_gn")
diff --git third_party/libwebrtc/api/task_queue/task_queue_gn/moz.build third_party/libwebrtc/api/task_queue/task_queue_gn/moz.build
index 1b9202605feb..7b569395601c 100644
--- third_party/libwebrtc/api/task_queue/task_queue_gn/moz.build
+++ third_party/libwebrtc/api/task_queue/task_queue_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("task_queue_gn")
diff --git third_party/libwebrtc/api/transport/bandwidth_estimation_settings_gn/moz.build third_party/libwebrtc/api/transport/bandwidth_estimation_settings_gn/moz.build
index a28ae055a99c..b7d91ce4bb39 100644
--- third_party/libwebrtc/api/transport/bandwidth_estimation_settings_gn/moz.build
+++ third_party/libwebrtc/api/transport/bandwidth_estimation_settings_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("bandwidth_estimation_settings_gn")
diff --git third_party/libwebrtc/api/transport/bandwidth_usage_gn/moz.build third_party/libwebrtc/api/transport/bandwidth_usage_gn/moz.build
index af1cf6a61469..31193b8387e4 100644
--- third_party/libwebrtc/api/transport/bandwidth_usage_gn/moz.build
+++ third_party/libwebrtc/api/transport/bandwidth_usage_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("bandwidth_usage_gn")
diff --git third_party/libwebrtc/api/transport/bitrate_settings_gn/moz.build third_party/libwebrtc/api/transport/bitrate_settings_gn/moz.build
index c0e089dbbef9..ac0f2ee8ebb9 100644
--- third_party/libwebrtc/api/transport/bitrate_settings_gn/moz.build
+++ third_party/libwebrtc/api/transport/bitrate_settings_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,82 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("bitrate_settings_gn")
diff --git third_party/libwebrtc/api/transport/datagram_transport_interface_gn/moz.build third_party/libwebrtc/api/transport/datagram_transport_interface_gn/moz.build
index 03d46cdf2d9f..fd039e329c8a 100644
--- third_party/libwebrtc/api/transport/datagram_transport_interface_gn/moz.build
+++ third_party/libwebrtc/api/transport/datagram_transport_interface_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,97 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -170,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("datagram_transport_interface_gn")
diff --git third_party/libwebrtc/api/transport/ecn_marking_gn/moz.build third_party/libwebrtc/api/transport/ecn_marking_gn/moz.build
index 2147bf05c182..d98760ed531b 100644
--- third_party/libwebrtc/api/transport/ecn_marking_gn/moz.build
+++ third_party/libwebrtc/api/transport/ecn_marking_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("ecn_marking_gn")
diff --git third_party/libwebrtc/api/transport/goog_cc_gn/moz.build third_party/libwebrtc/api/transport/goog_cc_gn/moz.build
index 9a1426c86b0f..7358fa645632 100644
--- third_party/libwebrtc/api/transport/goog_cc_gn/moz.build
+++ third_party/libwebrtc/api/transport/goog_cc_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("goog_cc_gn")
diff --git third_party/libwebrtc/api/transport/network_control_gn/moz.build third_party/libwebrtc/api/transport/network_control_gn/moz.build
index 77ad109d240f..dd9362a6e404 100644
--- third_party/libwebrtc/api/transport/network_control_gn/moz.build
+++ third_party/libwebrtc/api/transport/network_control_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("network_control_gn")
diff --git third_party/libwebrtc/api/transport/rtp/corruption_detection_message_gn/moz.build third_party/libwebrtc/api/transport/rtp/corruption_detection_message_gn/moz.build
index 1091a13e157a..3d86ed3cff45 100644
--- third_party/libwebrtc/api/transport/rtp/corruption_detection_message_gn/moz.build
+++ third_party/libwebrtc/api/transport/rtp/corruption_detection_message_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("corruption_detection_message_gn")
diff --git third_party/libwebrtc/api/transport/rtp/dependency_descriptor_gn/moz.build third_party/libwebrtc/api/transport/rtp/dependency_descriptor_gn/moz.build
index 7bd4c5d59059..138afb961580 100644
--- third_party/libwebrtc/api/transport/rtp/dependency_descriptor_gn/moz.build
+++ third_party/libwebrtc/api/transport/rtp/dependency_descriptor_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("dependency_descriptor_gn")
diff --git third_party/libwebrtc/api/transport/rtp/rtp_source_gn/moz.build third_party/libwebrtc/api/transport/rtp/rtp_source_gn/moz.build
index 46f54df8d5bd..b227722fbbee 100644
--- third_party/libwebrtc/api/transport/rtp/rtp_source_gn/moz.build
+++ third_party/libwebrtc/api/transport/rtp/rtp_source_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,97 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -170,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("rtp_source_gn")
diff --git third_party/libwebrtc/api/transport_api_gn/moz.build third_party/libwebrtc/api/transport_api_gn/moz.build
index 4f7ea7d1903b..3866a9acecac 100644
--- third_party/libwebrtc/api/transport_api_gn/moz.build
+++ third_party/libwebrtc/api/transport_api_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,82 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("transport_api_gn")
diff --git third_party/libwebrtc/api/units/data_rate_gn/moz.build third_party/libwebrtc/api/units/data_rate_gn/moz.build
index 902fd686b2d4..0d374429bb8d 100644
--- third_party/libwebrtc/api/units/data_rate_gn/moz.build
+++ third_party/libwebrtc/api/units/data_rate_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("data_rate_gn")
diff --git third_party/libwebrtc/api/units/data_size_gn/moz.build third_party/libwebrtc/api/units/data_size_gn/moz.build
index da7e52848a43..21aef137d719 100644
--- third_party/libwebrtc/api/units/data_size_gn/moz.build
+++ third_party/libwebrtc/api/units/data_size_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("data_size_gn")
diff --git third_party/libwebrtc/api/units/frequency_gn/moz.build third_party/libwebrtc/api/units/frequency_gn/moz.build
index 3a2f3e69044f..a255b57c7041 100644
--- third_party/libwebrtc/api/units/frequency_gn/moz.build
+++ third_party/libwebrtc/api/units/frequency_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("frequency_gn")
diff --git third_party/libwebrtc/api/units/time_delta_gn/moz.build third_party/libwebrtc/api/units/time_delta_gn/moz.build
index 1b65c1e4d12e..f496a2f4b969 100644
--- third_party/libwebrtc/api/units/time_delta_gn/moz.build
+++ third_party/libwebrtc/api/units/time_delta_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("time_delta_gn")
diff --git third_party/libwebrtc/api/units/timestamp_gn/moz.build third_party/libwebrtc/api/units/timestamp_gn/moz.build
index 72d4931ba797..04298c56ca8a 100644
--- third_party/libwebrtc/api/units/timestamp_gn/moz.build
+++ third_party/libwebrtc/api/units/timestamp_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("timestamp_gn")
diff --git third_party/libwebrtc/api/video/adapted_video_track_source_gn/moz.build third_party/libwebrtc/api/video/adapted_video_track_source_gn/moz.build
index 7cba11498853..479a9f84aed2 100644
--- third_party/libwebrtc/api/video/adapted_video_track_source_gn/moz.build
+++ third_party/libwebrtc/api/video/adapted_video_track_source_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("adapted_video_track_source_gn")
diff --git third_party/libwebrtc/api/video/builtin_video_bitrate_allocator_factory_gn/moz.build third_party/libwebrtc/api/video/builtin_video_bitrate_allocator_factory_gn/moz.build
index f2805d9c7bce..f3a4e759baeb 100644
--- third_party/libwebrtc/api/video/builtin_video_bitrate_allocator_factory_gn/moz.build
+++ third_party/libwebrtc/api/video/builtin_video_bitrate_allocator_factory_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("builtin_video_bitrate_allocator_factory_gn")
diff --git third_party/libwebrtc/api/video/corruption_detection/corruption_detection_settings_generator_gn/moz.build third_party/libwebrtc/api/video/corruption_detection/corruption_detection_settings_generator_gn/moz.build
index 5235825b2145..d58d0cdd1e99 100644
--- third_party/libwebrtc/api/video/corruption_detection/corruption_detection_settings_generator_gn/moz.build
+++ third_party/libwebrtc/api/video/corruption_detection/corruption_detection_settings_generator_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("corruption_detection_settings_generator_gn")
diff --git third_party/libwebrtc/api/video/corruption_detection/filter_settings_gn/moz.build third_party/libwebrtc/api/video/corruption_detection/filter_settings_gn/moz.build
index 24f88f2cd236..b51595d4a104 100644
--- third_party/libwebrtc/api/video/corruption_detection/filter_settings_gn/moz.build
+++ third_party/libwebrtc/api/video/corruption_detection/filter_settings_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("filter_settings_gn")
diff --git third_party/libwebrtc/api/video/corruption_detection/frame_instrumentation_data_gn/moz.build third_party/libwebrtc/api/video/corruption_detection/frame_instrumentation_data_gn/moz.build
index 2c561ebaba09..1b6c6c398127 100644
--- third_party/libwebrtc/api/video/corruption_detection/frame_instrumentation_data_gn/moz.build
+++ third_party/libwebrtc/api/video/corruption_detection/frame_instrumentation_data_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,82 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("frame_instrumentation_data_gn")
diff --git third_party/libwebrtc/api/video/corruption_detection/frame_instrumentation_data_reader_gn/moz.build third_party/libwebrtc/api/video/corruption_detection/frame_instrumentation_data_reader_gn/moz.build
index 3b3178ae7ff9..c03f7f785440 100644
--- third_party/libwebrtc/api/video/corruption_detection/frame_instrumentation_data_reader_gn/moz.build
+++ third_party/libwebrtc/api/video/corruption_detection/frame_instrumentation_data_reader_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("frame_instrumentation_data_reader_gn")
diff --git third_party/libwebrtc/api/video/corruption_detection/frame_instrumentation_evaluation_gn/moz.build third_party/libwebrtc/api/video/corruption_detection/frame_instrumentation_evaluation_gn/moz.build
index 0c77599abd2c..5a7e79f4fd79 100644
--- third_party/libwebrtc/api/video/corruption_detection/frame_instrumentation_evaluation_gn/moz.build
+++ third_party/libwebrtc/api/video/corruption_detection/frame_instrumentation_evaluation_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("frame_instrumentation_evaluation_gn")
diff --git third_party/libwebrtc/api/video/corruption_detection/frame_instrumentation_generator_factory_gn/moz.build third_party/libwebrtc/api/video/corruption_detection/frame_instrumentation_generator_factory_gn/moz.build
index 03fb8aabd10f..f15d88a8e9bd 100644
--- third_party/libwebrtc/api/video/corruption_detection/frame_instrumentation_generator_factory_gn/moz.build
+++ third_party/libwebrtc/api/video/corruption_detection/frame_instrumentation_generator_factory_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("frame_instrumentation_generator_factory_gn")
diff --git third_party/libwebrtc/api/video/corruption_detection/frame_instrumentation_generator_header_gn/moz.build third_party/libwebrtc/api/video/corruption_detection/frame_instrumentation_generator_header_gn/moz.build
index 44b336611c2e..47d68544494a 100644
--- third_party/libwebrtc/api/video/corruption_detection/frame_instrumentation_generator_header_gn/moz.build
+++ third_party/libwebrtc/api/video/corruption_detection/frame_instrumentation_generator_header_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,97 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -170,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("frame_instrumentation_generator_header_gn")
diff --git third_party/libwebrtc/api/video/encoded_frame_gn/moz.build third_party/libwebrtc/api/video/encoded_frame_gn/moz.build
index f4ce8a1127d3..cf3fe34de5b1 100644
--- third_party/libwebrtc/api/video/encoded_frame_gn/moz.build
+++ third_party/libwebrtc/api/video/encoded_frame_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("encoded_frame_gn")
diff --git third_party/libwebrtc/api/video/encoded_image_gn/moz.build third_party/libwebrtc/api/video/encoded_image_gn/moz.build
index b142f4ea91f2..41aad3b1df68 100644
--- third_party/libwebrtc/api/video/encoded_image_gn/moz.build
+++ third_party/libwebrtc/api/video/encoded_image_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("encoded_image_gn")
diff --git third_party/libwebrtc/api/video/frame_buffer_gn/moz.build third_party/libwebrtc/api/video/frame_buffer_gn/moz.build
index ef77d9e1523f..6da7aa155b9f 100644
--- third_party/libwebrtc/api/video/frame_buffer_gn/moz.build
+++ third_party/libwebrtc/api/video/frame_buffer_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("frame_buffer_gn")
diff --git third_party/libwebrtc/api/video/recordable_encoded_frame_gn/moz.build third_party/libwebrtc/api/video/recordable_encoded_frame_gn/moz.build
index 84959997b3f5..ee037b90e088 100644
--- third_party/libwebrtc/api/video/recordable_encoded_frame_gn/moz.build
+++ third_party/libwebrtc/api/video/recordable_encoded_frame_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,97 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -170,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("recordable_encoded_frame_gn")
diff --git third_party/libwebrtc/api/video/render_resolution_gn/moz.build third_party/libwebrtc/api/video/render_resolution_gn/moz.build
index 8f25723d0456..3df432f5d002 100644
--- third_party/libwebrtc/api/video/render_resolution_gn/moz.build
+++ third_party/libwebrtc/api/video/render_resolution_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("render_resolution_gn")
diff --git third_party/libwebrtc/api/video/resolution_gn/moz.build third_party/libwebrtc/api/video/resolution_gn/moz.build
index 072974a0a447..d96c3a30c3c1 100644
--- third_party/libwebrtc/api/video/resolution_gn/moz.build
+++ third_party/libwebrtc/api/video/resolution_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("resolution_gn")
diff --git third_party/libwebrtc/api/video/timing/video_jitter_timing_factory_gn/moz.build third_party/libwebrtc/api/video/timing/video_jitter_timing_factory_gn/moz.build
index e9a9997b47ae..0feb8b39b0b4 100644
--- third_party/libwebrtc/api/video/timing/video_jitter_timing_factory_gn/moz.build
+++ third_party/libwebrtc/api/video/timing/video_jitter_timing_factory_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,97 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -170,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("video_jitter_timing_factory_gn")
diff --git third_party/libwebrtc/api/video/timing/video_jitter_timing_interface_gn/moz.build third_party/libwebrtc/api/video/timing/video_jitter_timing_interface_gn/moz.build
index f4b4c4d6e5ef..eb34ed2a31e6 100644
--- third_party/libwebrtc/api/video/timing/video_jitter_timing_interface_gn/moz.build
+++ third_party/libwebrtc/api/video/timing/video_jitter_timing_interface_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,97 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -170,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("video_jitter_timing_interface_gn")
diff --git third_party/libwebrtc/api/video/video_adaptation_gn/moz.build third_party/libwebrtc/api/video/video_adaptation_gn/moz.build
index 44dc428f72bc..53b60bc077b2 100644
--- third_party/libwebrtc/api/video/video_adaptation_gn/moz.build
+++ third_party/libwebrtc/api/video/video_adaptation_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("video_adaptation_gn")
diff --git third_party/libwebrtc/api/video/video_adapter_gn/moz.build third_party/libwebrtc/api/video/video_adapter_gn/moz.build
index 4f484e8a9c0f..181c944ff9ae 100644
--- third_party/libwebrtc/api/video/video_adapter_gn/moz.build
+++ third_party/libwebrtc/api/video/video_adapter_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("video_adapter_gn")
diff --git third_party/libwebrtc/api/video/video_bitrate_allocation_gn/moz.build third_party/libwebrtc/api/video/video_bitrate_allocation_gn/moz.build
index d67ce8a850b3..31ade44fc7fc 100644
--- third_party/libwebrtc/api/video/video_bitrate_allocation_gn/moz.build
+++ third_party/libwebrtc/api/video/video_bitrate_allocation_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("video_bitrate_allocation_gn")
diff --git third_party/libwebrtc/api/video/video_bitrate_allocator_factory_gn/moz.build third_party/libwebrtc/api/video/video_bitrate_allocator_factory_gn/moz.build
index 85735be12d7f..40ae46d6c2fc 100644
--- third_party/libwebrtc/api/video/video_bitrate_allocator_factory_gn/moz.build
+++ third_party/libwebrtc/api/video/video_bitrate_allocator_factory_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,97 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -170,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("video_bitrate_allocator_factory_gn")
diff --git third_party/libwebrtc/api/video/video_bitrate_allocator_gn/moz.build third_party/libwebrtc/api/video/video_bitrate_allocator_gn/moz.build
index 76aedaffa7f9..afa5db2ee5ac 100644
--- third_party/libwebrtc/api/video/video_bitrate_allocator_gn/moz.build
+++ third_party/libwebrtc/api/video/video_bitrate_allocator_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("video_bitrate_allocator_gn")
diff --git third_party/libwebrtc/api/video/video_broadcaster_gn/moz.build third_party/libwebrtc/api/video/video_broadcaster_gn/moz.build
index 50136baa70f8..a9ba83131414 100644
--- third_party/libwebrtc/api/video/video_broadcaster_gn/moz.build
+++ third_party/libwebrtc/api/video/video_broadcaster_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("video_broadcaster_gn")
diff --git third_party/libwebrtc/api/video/video_codec_constants_gn/moz.build third_party/libwebrtc/api/video/video_codec_constants_gn/moz.build
index 16084b248724..f064ee2bdd24 100644
--- third_party/libwebrtc/api/video/video_codec_constants_gn/moz.build
+++ third_party/libwebrtc/api/video/video_codec_constants_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("video_codec_constants_gn")
diff --git third_party/libwebrtc/api/video/video_common_gn/moz.build third_party/libwebrtc/api/video/video_common_gn/moz.build
index 46cc94bb841f..e01aa13bed5d 100644
--- third_party/libwebrtc/api/video/video_common_gn/moz.build
+++ third_party/libwebrtc/api/video/video_common_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,93 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("video_common_gn")
diff --git third_party/libwebrtc/api/video/video_frame_gn/moz.build third_party/libwebrtc/api/video/video_frame_gn/moz.build
index ad81c3efc7eb..1d391652c1f2 100644
--- third_party/libwebrtc/api/video/video_frame_gn/moz.build
+++ third_party/libwebrtc/api/video/video_frame_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -59,97 +68,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -157,82 +76,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("video_frame_gn")
diff --git third_party/libwebrtc/api/video/video_frame_i010_gn/moz.build third_party/libwebrtc/api/video/video_frame_i010_gn/moz.build
index 4a9b176a9efa..e3bc1228cb41 100644
--- third_party/libwebrtc/api/video/video_frame_i010_gn/moz.build
+++ third_party/libwebrtc/api/video/video_frame_i010_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -55,97 +64,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -153,82 +72,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("video_frame_i010_gn")
diff --git third_party/libwebrtc/api/video/video_frame_metadata_gn/moz.build third_party/libwebrtc/api/video/video_frame_metadata_gn/moz.build
index f1c229f77838..ac7f2b79b957 100644
--- third_party/libwebrtc/api/video/video_frame_metadata_gn/moz.build
+++ third_party/libwebrtc/api/video/video_frame_metadata_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("video_frame_metadata_gn")
diff --git third_party/libwebrtc/api/video/video_frame_type_gn/moz.build third_party/libwebrtc/api/video/video_frame_type_gn/moz.build
index f7c6aa3d84b5..cfaf6cdc5449 100644
--- third_party/libwebrtc/api/video/video_frame_type_gn/moz.build
+++ third_party/libwebrtc/api/video/video_frame_type_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,86 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -159,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("video_frame_type_gn")
diff --git third_party/libwebrtc/api/video/video_layers_allocation_gn/moz.build third_party/libwebrtc/api/video/video_layers_allocation_gn/moz.build
index 5ded89cc499e..bd40fdea54f9 100644
--- third_party/libwebrtc/api/video/video_layers_allocation_gn/moz.build
+++ third_party/libwebrtc/api/video/video_layers_allocation_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,86 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -159,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("video_layers_allocation_gn")
diff --git third_party/libwebrtc/api/video/video_rtp_headers_gn/moz.build third_party/libwebrtc/api/video/video_rtp_headers_gn/moz.build
index 407feb30b956..3fe5d732a663 100644
--- third_party/libwebrtc/api/video/video_rtp_headers_gn/moz.build
+++ third_party/libwebrtc/api/video/video_rtp_headers_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -51,97 +60,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -149,82 +68,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("video_rtp_headers_gn")
diff --git third_party/libwebrtc/api/video/video_stream_encoder_gn/moz.build third_party/libwebrtc/api/video/video_stream_encoder_gn/moz.build
index 46ef39722717..88e814f1f486 100644
--- third_party/libwebrtc/api/video/video_stream_encoder_gn/moz.build
+++ third_party/libwebrtc/api/video/video_stream_encoder_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,97 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -170,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("video_stream_encoder_gn")
diff --git third_party/libwebrtc/api/video_codecs/bitstream_parser_api_gn/moz.build third_party/libwebrtc/api/video_codecs/bitstream_parser_api_gn/moz.build
index 2ff7b5ca279e..ac1223acf1a1 100644
--- third_party/libwebrtc/api/video_codecs/bitstream_parser_api_gn/moz.build
+++ third_party/libwebrtc/api/video_codecs/bitstream_parser_api_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("bitstream_parser_api_gn")
diff --git third_party/libwebrtc/api/video_codecs/builtin_video_decoder_factory_gn/moz.build third_party/libwebrtc/api/video_codecs/builtin_video_decoder_factory_gn/moz.build
index 7f44f2d6aeba..f46cd69528a6 100644
--- third_party/libwebrtc/api/video_codecs/builtin_video_decoder_factory_gn/moz.build
+++ third_party/libwebrtc/api/video_codecs/builtin_video_decoder_factory_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("builtin_video_decoder_factory_gn")
diff --git third_party/libwebrtc/api/video_codecs/encoder_speed_controller_factory_gn/moz.build third_party/libwebrtc/api/video_codecs/encoder_speed_controller_factory_gn/moz.build
index eda9b92eb3f5..f9e4b061937a 100644
--- third_party/libwebrtc/api/video_codecs/encoder_speed_controller_factory_gn/moz.build
+++ third_party/libwebrtc/api/video_codecs/encoder_speed_controller_factory_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("encoder_speed_controller_factory_gn")
diff --git third_party/libwebrtc/api/video_codecs/rtc_software_fallback_wrappers_gn/moz.build third_party/libwebrtc/api/video_codecs/rtc_software_fallback_wrappers_gn/moz.build
index cfb9c8d49dfa..5157e66516d3 100644
--- third_party/libwebrtc/api/video_codecs/rtc_software_fallback_wrappers_gn/moz.build
+++ third_party/libwebrtc/api/video_codecs/rtc_software_fallback_wrappers_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -49,97 +58,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -147,82 +66,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("rtc_software_fallback_wrappers_gn")
diff --git third_party/libwebrtc/api/video_codecs/scalability_mode_gn/moz.build third_party/libwebrtc/api/video_codecs/scalability_mode_gn/moz.build
index ba0139aff2d0..3b0555b682fe 100644
--- third_party/libwebrtc/api/video_codecs/scalability_mode_gn/moz.build
+++ third_party/libwebrtc/api/video_codecs/scalability_mode_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("scalability_mode_gn")
diff --git third_party/libwebrtc/api/video_codecs/scalability_mode_helper_gn/moz.build third_party/libwebrtc/api/video_codecs/scalability_mode_helper_gn/moz.build
index 20c635392963..b183ee060fbe 100644
--- third_party/libwebrtc/api/video_codecs/scalability_mode_helper_gn/moz.build
+++ third_party/libwebrtc/api/video_codecs/scalability_mode_helper_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("scalability_mode_helper_gn")
diff --git third_party/libwebrtc/api/video_codecs/video_codecs_api_gn/moz.build third_party/libwebrtc/api/video_codecs/video_codecs_api_gn/moz.build
index f7c8a956f348..195244de2fb3 100644
--- third_party/libwebrtc/api/video_codecs/video_codecs_api_gn/moz.build
+++ third_party/libwebrtc/api/video_codecs/video_codecs_api_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -59,97 +68,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -157,82 +76,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("video_codecs_api_gn")
diff --git third_party/libwebrtc/api/video_codecs/video_encoder_factory_template_gn/moz.build third_party/libwebrtc/api/video_codecs/video_encoder_factory_template_gn/moz.build
index b562cafbbf43..354e1f8ba603 100644
--- third_party/libwebrtc/api/video_codecs/video_encoder_factory_template_gn/moz.build
+++ third_party/libwebrtc/api/video_codecs/video_encoder_factory_template_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,97 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -170,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("video_encoder_factory_template_gn")
diff --git third_party/libwebrtc/api/video_codecs/video_encoder_factory_template_libaom_av1_adapter_gn/moz.build third_party/libwebrtc/api/video_codecs/video_encoder_factory_template_libaom_av1_adapter_gn/moz.build
index 75c1ca6f5d4f..593e2e327e30 100644
--- third_party/libwebrtc/api/video_codecs/video_encoder_factory_template_libaom_av1_adapter_gn/moz.build
+++ third_party/libwebrtc/api/video_codecs/video_encoder_factory_template_libaom_av1_adapter_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,97 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -170,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("video_encoder_factory_template_libaom_av1_adapter_gn")
diff --git third_party/libwebrtc/api/video_codecs/video_encoder_factory_template_libvpx_vp8_adapter_gn/moz.build third_party/libwebrtc/api/video_codecs/video_encoder_factory_template_libvpx_vp8_adapter_gn/moz.build
index 5ce79e986546..1bc8a0f25730 100644
--- third_party/libwebrtc/api/video_codecs/video_encoder_factory_template_libvpx_vp8_adapter_gn/moz.build
+++ third_party/libwebrtc/api/video_codecs/video_encoder_factory_template_libvpx_vp8_adapter_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,97 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -170,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("video_encoder_factory_template_libvpx_vp8_adapter_gn")
diff --git third_party/libwebrtc/api/video_codecs/video_encoder_factory_template_libvpx_vp9_adapter_gn/moz.build third_party/libwebrtc/api/video_codecs/video_encoder_factory_template_libvpx_vp9_adapter_gn/moz.build
index 2e9e2e4f0250..e68242decf2a 100644
--- third_party/libwebrtc/api/video_codecs/video_encoder_factory_template_libvpx_vp9_adapter_gn/moz.build
+++ third_party/libwebrtc/api/video_codecs/video_encoder_factory_template_libvpx_vp9_adapter_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,97 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -170,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("video_encoder_factory_template_libvpx_vp9_adapter_gn")
diff --git third_party/libwebrtc/api/video_codecs/video_encoder_factory_template_open_h264_adapter_gn/moz.build third_party/libwebrtc/api/video_codecs/video_encoder_factory_template_open_h264_adapter_gn/moz.build
index 1183122cdcd3..25de67a34824 100644
--- third_party/libwebrtc/api/video_codecs/video_encoder_factory_template_open_h264_adapter_gn/moz.build
+++ third_party/libwebrtc/api/video_codecs/video_encoder_factory_template_open_h264_adapter_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,97 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -170,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("video_encoder_factory_template_open_h264_adapter_gn")
diff --git third_party/libwebrtc/api/video_codecs/vp8_temporal_layers_factory_gn/moz.build third_party/libwebrtc/api/video_codecs/vp8_temporal_layers_factory_gn/moz.build
index ec4a04826d5e..9bb30c40f623 100644
--- third_party/libwebrtc/api/video_codecs/vp8_temporal_layers_factory_gn/moz.build
+++ third_party/libwebrtc/api/video_codecs/vp8_temporal_layers_factory_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("vp8_temporal_layers_factory_gn")
diff --git third_party/libwebrtc/api/video_track_source_constraints_gn/moz.build third_party/libwebrtc/api/video_track_source_constraints_gn/moz.build
index 3bf4a5fe924b..f4a9c5aca1b4 100644
--- third_party/libwebrtc/api/video_track_source_constraints_gn/moz.build
+++ third_party/libwebrtc/api/video_track_source_constraints_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("video_track_source_constraints_gn")
diff --git third_party/libwebrtc/audio/audio_gn/moz.build third_party/libwebrtc/audio/audio_gn/moz.build
index 373d7ef6fdb5..b629cfdbcc0d 100644
--- third_party/libwebrtc/audio/audio_gn/moz.build
+++ third_party/libwebrtc/audio/audio_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -61,98 +70,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "GLESv2",
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -160,82 +78,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("audio_gn")
diff --git third_party/libwebrtc/audio/utility/audio_frame_operations_gn/moz.build third_party/libwebrtc/audio/utility/audio_frame_operations_gn/moz.build
index c3c0e3006c64..dc7aab44268e 100644
--- third_party/libwebrtc/audio/utility/audio_frame_operations_gn/moz.build
+++ third_party/libwebrtc/audio/utility/audio_frame_operations_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -50,97 +59,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -148,82 +67,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("audio_frame_operations_gn")
diff --git third_party/libwebrtc/call/adaptation/resource_adaptation_gn/moz.build third_party/libwebrtc/call/adaptation/resource_adaptation_gn/moz.build
index c8f0ded947a6..41a2700e2e3e 100644
--- third_party/libwebrtc/call/adaptation/resource_adaptation_gn/moz.build
+++ third_party/libwebrtc/call/adaptation/resource_adaptation_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -57,97 +66,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -155,82 +74,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("resource_adaptation_gn")
diff --git third_party/libwebrtc/call/audio_sender_interface_gn/moz.build third_party/libwebrtc/call/audio_sender_interface_gn/moz.build
index 44ae28e7041f..85c4ac81a495 100644
--- third_party/libwebrtc/call/audio_sender_interface_gn/moz.build
+++ third_party/libwebrtc/call/audio_sender_interface_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,97 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -170,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("audio_sender_interface_gn")
diff --git third_party/libwebrtc/call/bitrate_allocator_gn/moz.build third_party/libwebrtc/call/bitrate_allocator_gn/moz.build
index b58643fe405a..6c9b55a58643 100644
--- third_party/libwebrtc/call/bitrate_allocator_gn/moz.build
+++ third_party/libwebrtc/call/bitrate_allocator_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("bitrate_allocator_gn")
diff --git third_party/libwebrtc/call/bitrate_configurator_gn/moz.build third_party/libwebrtc/call/bitrate_configurator_gn/moz.build
index aad6f46b41b8..ea1459530235 100644
--- third_party/libwebrtc/call/bitrate_configurator_gn/moz.build
+++ third_party/libwebrtc/call/bitrate_configurator_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("bitrate_configurator_gn")
diff --git third_party/libwebrtc/call/call_gn/moz.build third_party/libwebrtc/call/call_gn/moz.build
index 2e3d04ba9d0a..17eda8699c74 100644
--- third_party/libwebrtc/call/call_gn/moz.build
+++ third_party/libwebrtc/call/call_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -49,98 +58,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "GLESv2",
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -148,82 +66,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("call_gn")
diff --git third_party/libwebrtc/call/call_interfaces_gn/moz.build third_party/libwebrtc/call/call_interfaces_gn/moz.build
index fa31551ccfba..79f3a5551dea 100644
--- third_party/libwebrtc/call/call_interfaces_gn/moz.build
+++ third_party/libwebrtc/call/call_interfaces_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -53,97 +62,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -151,82 +70,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("call_interfaces_gn")
diff --git third_party/libwebrtc/call/payload_type_gn/moz.build third_party/libwebrtc/call/payload_type_gn/moz.build
index b19dd1a580f2..b7367d42a6d0 100644
--- third_party/libwebrtc/call/payload_type_gn/moz.build
+++ third_party/libwebrtc/call/payload_type_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,97 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -170,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("payload_type_gn")
diff --git third_party/libwebrtc/call/payload_type_picker_gn/moz.build third_party/libwebrtc/call/payload_type_picker_gn/moz.build
index 26dd4a204cab..a229ef48671d 100644
--- third_party/libwebrtc/call/payload_type_picker_gn/moz.build
+++ third_party/libwebrtc/call/payload_type_picker_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("payload_type_picker_gn")
diff --git third_party/libwebrtc/call/receive_stream_interface_gn/moz.build third_party/libwebrtc/call/receive_stream_interface_gn/moz.build
index da34b3ca2fe7..dac4c35077d3 100644
--- third_party/libwebrtc/call/receive_stream_interface_gn/moz.build
+++ third_party/libwebrtc/call/receive_stream_interface_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,97 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -170,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("receive_stream_interface_gn")
diff --git third_party/libwebrtc/call/rtp_interfaces_gn/moz.build third_party/libwebrtc/call/rtp_interfaces_gn/moz.build
index 0889a5f46a38..e94756d685e3 100644
--- third_party/libwebrtc/call/rtp_interfaces_gn/moz.build
+++ third_party/libwebrtc/call/rtp_interfaces_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("rtp_interfaces_gn")
diff --git third_party/libwebrtc/call/rtp_receiver_gn/moz.build third_party/libwebrtc/call/rtp_receiver_gn/moz.build
index c6c7e3774e32..9af86a12fa21 100644
--- third_party/libwebrtc/call/rtp_receiver_gn/moz.build
+++ third_party/libwebrtc/call/rtp_receiver_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -50,97 +59,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -148,82 +67,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("rtp_receiver_gn")
diff --git third_party/libwebrtc/call/rtp_sender_gn/moz.build third_party/libwebrtc/call/rtp_sender_gn/moz.build
index 20e846666474..5dc483e5fe0f 100644
--- third_party/libwebrtc/call/rtp_sender_gn/moz.build
+++ third_party/libwebrtc/call/rtp_sender_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -50,97 +59,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -148,82 +67,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("rtp_sender_gn")
diff --git third_party/libwebrtc/call/version_gn/moz.build third_party/libwebrtc/call/version_gn/moz.build
index 834e4c149bfd..5ca2ce56f4c3 100644
--- third_party/libwebrtc/call/version_gn/moz.build
+++ third_party/libwebrtc/call/version_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,82 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("version_gn")
diff --git third_party/libwebrtc/call/video_receive_stream_api_gn/moz.build third_party/libwebrtc/call/video_receive_stream_api_gn/moz.build
index 406dc1995e0b..0cf7085e47c7 100644
--- third_party/libwebrtc/call/video_receive_stream_api_gn/moz.build
+++ third_party/libwebrtc/call/video_receive_stream_api_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("video_receive_stream_api_gn")
diff --git third_party/libwebrtc/call/video_send_stream_api_gn/moz.build third_party/libwebrtc/call/video_send_stream_api_gn/moz.build
index 2dba8deaecd0..f1ed2876e6eb 100644
--- third_party/libwebrtc/call/video_send_stream_api_gn/moz.build
+++ third_party/libwebrtc/call/video_send_stream_api_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("video_send_stream_api_gn")
diff --git third_party/libwebrtc/common_audio/common_audio_avx2_gn/moz.build third_party/libwebrtc/common_audio/common_audio_avx2_gn/moz.build
index 649c013c4678..9c0edb65d9d7 100644
--- third_party/libwebrtc/common_audio/common_audio_avx2_gn/moz.build
+++ third_party/libwebrtc/common_audio/common_audio_avx2_gn/moz.build
@@ -18,6 +18,9 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_AVX2"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
@@ -25,8 +28,14 @@ DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -55,126 +64,9 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
     DEFINES["_DEBUG"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
+if CONFIG["TARGET_CPU"] == "x86":
 
     CXXFLAGS += [
         "-msse2"
diff --git third_party/libwebrtc/common_audio/common_audio_c_arm_asm_gn/moz.build third_party/libwebrtc/common_audio/common_audio_c_arm_asm_gn/moz.build
index ec85cbc72e3d..8d404348be4f 100644
--- third_party/libwebrtc/common_audio/common_audio_c_arm_asm_gn/moz.build
+++ third_party/libwebrtc/common_audio/common_audio_c_arm_asm_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,30 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-    SOURCES += [
-        "/third_party/libwebrtc/common_audio/signal_processing/complex_bit_reverse_arm.S",
-        "/third_party/libwebrtc/common_audio/signal_processing/filter_ar_fast_q12_armv7.S"
-    ]
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -160,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("common_audio_c_arm_asm_gn")
diff --git third_party/libwebrtc/common_audio/common_audio_c_gn/moz.build third_party/libwebrtc/common_audio/common_audio_c_gn/moz.build
index 1de00fd7d8cc..fc7fe8d9ddf7 100644
--- third_party/libwebrtc/common_audio/common_audio_c_gn/moz.build
+++ third_party/libwebrtc/common_audio/common_audio_c_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -84,108 +93,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-    UNIFIED_SOURCES += [
-        "/third_party/libwebrtc/common_audio/signal_processing/complex_fft.c"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    UNIFIED_SOURCES += [
-        "/third_party/libwebrtc/common_audio/signal_processing/complex_bit_reverse.c",
-        "/third_party/libwebrtc/common_audio/signal_processing/complex_fft.c",
-        "/third_party/libwebrtc/common_audio/signal_processing/filter_ar_fast_q12.c"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    UNIFIED_SOURCES += [
-        "/third_party/libwebrtc/common_audio/signal_processing/complex_bit_reverse.c",
-        "/third_party/libwebrtc/common_audio/signal_processing/complex_fft.c",
-        "/third_party/libwebrtc/common_audio/signal_processing/filter_ar_fast_q12.c"
-    ]
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    UNIFIED_SOURCES += [
-        "/third_party/libwebrtc/common_audio/signal_processing/complex_bit_reverse.c",
-        "/third_party/libwebrtc/common_audio/signal_processing/complex_fft.c",
-        "/third_party/libwebrtc/common_audio/signal_processing/filter_ar_fast_q12.c"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -193,20 +101,14 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CFLAGS += [
-        "-mfpu=neon"
+    UNIFIED_SOURCES += [
+        "/third_party/libwebrtc/common_audio/signal_processing/complex_bit_reverse.c",
+        "/third_party/libwebrtc/common_audio/signal_processing/complex_fft.c",
+        "/third_party/libwebrtc/common_audio/signal_processing/filter_ar_fast_q12.c"
     ]
 
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
 if CONFIG["TARGET_CPU"] == "loongarch64":
 
-    DEFINES["_GNU_SOURCE"] = True
-
     UNIFIED_SOURCES += [
         "/third_party/libwebrtc/common_audio/signal_processing/complex_bit_reverse.c",
         "/third_party/libwebrtc/common_audio/signal_processing/complex_fft.c",
@@ -217,7 +119,6 @@ if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
 
     SOURCES += [
         "/third_party/libwebrtc/common_audio/signal_processing/resample_by_2_mips.c"
@@ -234,8 +135,6 @@ if CONFIG["TARGET_CPU"] == "mips32":
 
 if CONFIG["TARGET_CPU"] == "mips64":
 
-    DEFINES["_GNU_SOURCE"] = True
-
     UNIFIED_SOURCES += [
         "/third_party/libwebrtc/common_audio/signal_processing/complex_bit_reverse.c",
         "/third_party/libwebrtc/common_audio/signal_processing/complex_fft.c",
@@ -250,78 +149,7 @@ if CONFIG["TARGET_CPU"] == "ppc64":
         "/third_party/libwebrtc/common_audio/signal_processing/filter_ar_fast_q12.c"
     ]
 
-if CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    UNIFIED_SOURCES += [
-        "/third_party/libwebrtc/common_audio/signal_processing/complex_bit_reverse.c",
-        "/third_party/libwebrtc/common_audio/signal_processing/filter_ar_fast_q12.c"
-    ]
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
-    CFLAGS += [
-        "-msse2"
-    ]
-
-    UNIFIED_SOURCES += [
-        "/third_party/libwebrtc/common_audio/signal_processing/complex_bit_reverse.c",
-        "/third_party/libwebrtc/common_audio/signal_processing/filter_ar_fast_q12.c"
-    ]
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    UNIFIED_SOURCES += [
-        "/third_party/libwebrtc/common_audio/signal_processing/complex_bit_reverse.c",
-        "/third_party/libwebrtc/common_audio/signal_processing/filter_ar_fast_q12.c"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-    UNIFIED_SOURCES += [
-        "/third_party/libwebrtc/common_audio/signal_processing/complex_bit_reverse.c",
-        "/third_party/libwebrtc/common_audio/signal_processing/complex_fft.c",
-        "/third_party/libwebrtc/common_audio/signal_processing/filter_ar_fast_q12.c"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-    UNIFIED_SOURCES += [
-        "/third_party/libwebrtc/common_audio/signal_processing/complex_fft.c"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "riscv64":
+if CONFIG["TARGET_CPU"] == "riscv64":
 
     UNIFIED_SOURCES += [
         "/third_party/libwebrtc/common_audio/signal_processing/complex_bit_reverse.c",
@@ -329,13 +157,13 @@ if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "riscv64":
         "/third_party/libwebrtc/common_audio/signal_processing/filter_ar_fast_q12.c"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
+if CONFIG["TARGET_CPU"] == "x86":
 
     CFLAGS += [
         "-msse2"
     ]
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
     UNIFIED_SOURCES += [
         "/third_party/libwebrtc/common_audio/signal_processing/complex_bit_reverse.c",
@@ -343,9 +171,9 @@ if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
         "/third_party/libwebrtc/common_audio/signal_processing/filter_ar_fast_q12.c"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
     UNIFIED_SOURCES += [
         "/third_party/libwebrtc/common_audio/signal_processing/complex_bit_reverse.c",
diff --git third_party/libwebrtc/common_audio/common_audio_cc_gn/moz.build third_party/libwebrtc/common_audio/common_audio_cc_gn/moz.build
index 1937e379d9d7..80e0a5da3f77 100644
--- third_party/libwebrtc/common_audio/common_audio_cc_gn/moz.build
+++ third_party/libwebrtc/common_audio/common_audio_cc_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("common_audio_cc_gn")
diff --git third_party/libwebrtc/common_audio/common_audio_gn/moz.build third_party/libwebrtc/common_audio/common_audio_gn/moz.build
index c2f9e03f9b27..4d244333c1cd 100644
--- third_party/libwebrtc/common_audio/common_audio_gn/moz.build
+++ third_party/libwebrtc/common_audio/common_audio_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -61,97 +70,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -159,82 +78,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("common_audio_gn")
diff --git third_party/libwebrtc/common_audio/common_audio_neon_c_gn/moz.build third_party/libwebrtc/common_audio/common_audio_neon_c_gn/moz.build
index 39c9a92e9e57..083576ee20de 100644
--- third_party/libwebrtc/common_audio/common_audio_neon_c_gn/moz.build
+++ third_party/libwebrtc/common_audio/common_audio_neon_c_gn/moz.build
@@ -13,6 +13,10 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_ARCH_ARM64"] = True
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
@@ -20,8 +24,15 @@ DEFINES["WEBRTC_HAS_NEON"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__ARM_NEON__"] = "1"
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -51,131 +62,6 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_ARCH_ARM64"] = True
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__ARM_NEON__"] = "1"
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_ARCH_ARM64"] = True
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__ARM_NEON__"] = "1"
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_ARCH_ARM64"] = True
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__ARM_NEON__"] = "1"
-    DEFINES["__STD_C"] = True
-
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
     DEFINES["_DEBUG"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["WEBRTC_ARCH_ARM64"] = True
-    DEFINES["__ARM_NEON__"] = "1"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["WEBRTC_ARCH_ARM64"] = True
-    DEFINES["__ARM_NEON__"] = "1"
-
 Library("common_audio_neon_c_gn")
diff --git third_party/libwebrtc/common_audio/common_audio_neon_gn/moz.build third_party/libwebrtc/common_audio/common_audio_neon_gn/moz.build
index e3fd56b712db..4bccaa52fccb 100644
--- third_party/libwebrtc/common_audio/common_audio_neon_gn/moz.build
+++ third_party/libwebrtc/common_audio/common_audio_neon_gn/moz.build
@@ -13,6 +13,10 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_ARCH_ARM64"] = True
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
@@ -20,8 +24,15 @@ DEFINES["WEBRTC_HAS_NEON"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__ARM_NEON__"] = "1"
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -50,142 +61,6 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_ARCH_ARM64"] = True
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__ARM_NEON__"] = "1"
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_ARCH_ARM64"] = True
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__ARM_NEON__"] = "1"
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_ARCH_ARM64"] = True
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__ARM_NEON__"] = "1"
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
-
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
     DEFINES["_DEBUG"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["WEBRTC_ARCH_ARM64"] = True
-    DEFINES["__ARM_NEON__"] = "1"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["WEBRTC_ARCH_ARM64"] = True
-    DEFINES["__ARM_NEON__"] = "1"
-
 Library("common_audio_neon_gn")
diff --git third_party/libwebrtc/common_audio/common_audio_sse2_gn/moz.build third_party/libwebrtc/common_audio/common_audio_sse2_gn/moz.build
index 66cf5f361e07..d83202adcbea 100644
--- third_party/libwebrtc/common_audio/common_audio_sse2_gn/moz.build
+++ third_party/libwebrtc/common_audio/common_audio_sse2_gn/moz.build
@@ -13,6 +13,9 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_AVX2"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
@@ -20,8 +23,14 @@ DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -50,148 +59,16 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
     DEFINES["_DEBUG"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2",
-        "-msse2"
-    ]
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
+if CONFIG["TARGET_CPU"] == "x86":
 
     CXXFLAGS += [
         "-msse2",
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
     CXXFLAGS += [
         "-msse2"
diff --git third_party/libwebrtc/common_audio/fir_filter_gn/moz.build third_party/libwebrtc/common_audio/fir_filter_gn/moz.build
index b29d53f75549..a81e545d438e 100644
--- third_party/libwebrtc/common_audio/fir_filter_gn/moz.build
+++ third_party/libwebrtc/common_audio/fir_filter_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,83 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -128,12 +61,6 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
 if CONFIG["TARGET_CPU"] == "x86":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
@@ -142,24 +69,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
 Library("fir_filter_gn")
diff --git third_party/libwebrtc/common_audio/sinc_resampler_gn/moz.build third_party/libwebrtc/common_audio/sinc_resampler_gn/moz.build
index 3c447c3bbb01..922eb068a917 100644
--- third_party/libwebrtc/common_audio/sinc_resampler_gn/moz.build
+++ third_party/libwebrtc/common_audio/sinc_resampler_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,97 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -170,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("sinc_resampler_gn")
diff --git third_party/libwebrtc/common_audio/third_party/ooura/fft_size_128_gn/moz.build third_party/libwebrtc/common_audio/third_party/ooura/fft_size_128_gn/moz.build
index 707f0c97c1ca..7f74630c891e 100644
--- third_party/libwebrtc/common_audio/third_party/ooura/fft_size_128_gn/moz.build
+++ third_party/libwebrtc/common_audio/third_party/ooura/fft_size_128_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -150,122 +69,38 @@ if CONFIG["TARGET_CPU"] == "aarch64":
         "/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_128/ooura_fft_neon.cc"
     ]
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-    UNIFIED_SOURCES += [
-        "/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_128/ooura_fft_neon.cc"
-    ]
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
 
     UNIFIED_SOURCES += [
         "/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_128/ooura_fft_mips.cc"
     ]
 
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-    UNIFIED_SOURCES += [
-        "/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_128/ooura_fft_sse2.cc"
-    ]
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-    UNIFIED_SOURCES += [
-        "/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_128/ooura_fft_sse2.cc"
-    ]
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2",
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-    CXXFLAGS += [
-        "-msse2",
-        "-msse2"
+    UNIFIED_SOURCES += [
+        "/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_128/ooura_fft_sse2.cc"
     ]
 
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
     CXXFLAGS += [
         "-msse2"
     ]
 
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD" and CONFIG["TARGET_CPU"] == "x86_64":
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-    CXXFLAGS += [
-        "-msse2"
+    UNIFIED_SOURCES += [
+        "/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_128/ooura_fft_sse2.cc"
     ]
 
 Library("fft_size_128_gn")
diff --git third_party/libwebrtc/common_audio/third_party/ooura/fft_size_256_gn/moz.build third_party/libwebrtc/common_audio/third_party/ooura/fft_size_256_gn/moz.build
index 7f5637d816cb..7c697cac889e 100644
--- third_party/libwebrtc/common_audio/third_party/ooura/fft_size_256_gn/moz.build
+++ third_party/libwebrtc/common_audio/third_party/ooura/fft_size_256_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,82 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("fft_size_256_gn")
diff --git third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor_gn/moz.build third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor_gn/moz.build
index 93d7a76cce7d..46b4ee8b8aad 100644
--- third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor_gn/moz.build
+++ third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,94 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    UNIFIED_SOURCES += [
-        "/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor.c"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    UNIFIED_SOURCES += [
-        "/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor.c"
-    ]
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    UNIFIED_SOURCES += [
-        "/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor.c"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -139,20 +61,12 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-    SOURCES += [
-        "/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor_arm.S"
+    UNIFIED_SOURCES += [
+        "/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor.c"
     ]
 
 if CONFIG["TARGET_CPU"] == "loongarch64":
 
-    DEFINES["_GNU_SOURCE"] = True
-
     UNIFIED_SOURCES += [
         "/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor.c"
     ]
@@ -161,7 +75,6 @@ if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
 
     UNIFIED_SOURCES += [
         "/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor_mips.c"
@@ -169,8 +82,6 @@ if CONFIG["TARGET_CPU"] == "mips32":
 
 if CONFIG["TARGET_CPU"] == "mips64":
 
-    DEFINES["_GNU_SOURCE"] = True
-
     UNIFIED_SOURCES += [
         "/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor.c"
     ]
@@ -181,89 +92,27 @@ if CONFIG["TARGET_CPU"] == "ppc64":
         "/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor.c"
     ]
 
-if CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    UNIFIED_SOURCES += [
-        "/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor.c"
-    ]
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
-    CFLAGS += [
-        "-msse2"
-    ]
+if CONFIG["TARGET_CPU"] == "riscv64":
 
     UNIFIED_SOURCES += [
         "/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor.c"
     ]
 
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    UNIFIED_SOURCES += [
-        "/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor.c"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-    UNIFIED_SOURCES += [
-        "/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor.c"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "riscv64":
-
-    UNIFIED_SOURCES += [
-        "/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor.c"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
+if CONFIG["TARGET_CPU"] == "x86":
 
     CFLAGS += [
         "-msse2"
     ]
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
     UNIFIED_SOURCES += [
         "/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor.c"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
     UNIFIED_SOURCES += [
         "/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor.c"
diff --git third_party/libwebrtc/common_video/common_video_gn/moz.build third_party/libwebrtc/common_video/common_video_gn/moz.build
index d97c973ceedf..462c16b4c020 100644
--- third_party/libwebrtc/common_video/common_video_gn/moz.build
+++ third_party/libwebrtc/common_video/common_video_gn/moz.build
@@ -14,14 +14,23 @@ DEFINES["HAVE_LIBYUV_JPEG"] = True
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -61,97 +70,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -159,82 +78,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("common_video_gn")
diff --git third_party/libwebrtc/common_video/corruption_score_calculator_gn/moz.build third_party/libwebrtc/common_video/corruption_score_calculator_gn/moz.build
index 48b476d3b835..1d39908210a3 100644
--- third_party/libwebrtc/common_video/corruption_score_calculator_gn/moz.build
+++ third_party/libwebrtc/common_video/corruption_score_calculator_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,97 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -170,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("corruption_score_calculator_gn")
diff --git third_party/libwebrtc/common_video/frame_counts_gn/moz.build third_party/libwebrtc/common_video/frame_counts_gn/moz.build
index 23c7844126d9..b868fe947216 100644
--- third_party/libwebrtc/common_video/frame_counts_gn/moz.build
+++ third_party/libwebrtc/common_video/frame_counts_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("frame_counts_gn")
diff --git third_party/libwebrtc/common_video/generic_frame_descriptor/generic_frame_descriptor_gn/moz.build third_party/libwebrtc/common_video/generic_frame_descriptor/generic_frame_descriptor_gn/moz.build
index 62267c9942ca..b61df38e600f 100644
--- third_party/libwebrtc/common_video/generic_frame_descriptor/generic_frame_descriptor_gn/moz.build
+++ third_party/libwebrtc/common_video/generic_frame_descriptor/generic_frame_descriptor_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("generic_frame_descriptor_gn")
diff --git third_party/libwebrtc/dcsctp_gn/moz.build third_party/libwebrtc/dcsctp_gn/moz.build
index bdb306746125..f7a1febddea5 100644
--- third_party/libwebrtc/dcsctp_gn/moz.build
+++ third_party/libwebrtc/dcsctp_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,97 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -170,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("dcsctp_gn")
diff --git third_party/libwebrtc/experiments/registered_field_trials_gn/moz.build third_party/libwebrtc/experiments/registered_field_trials_gn/moz.build
index 823a75af3811..9e03f629c0dd 100644
--- third_party/libwebrtc/experiments/registered_field_trials_gn/moz.build
+++ third_party/libwebrtc/experiments/registered_field_trials_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("registered_field_trials_gn")
diff --git third_party/libwebrtc/experiments/registered_field_trials_header_gn/moz.build third_party/libwebrtc/experiments/registered_field_trials_header_gn/moz.build
index edb8e084a33a..e2236e78c4a0 100644
--- third_party/libwebrtc/experiments/registered_field_trials_header_gn/moz.build
+++ third_party/libwebrtc/experiments/registered_field_trials_header_gn/moz.build
@@ -32,9 +32,4 @@ LOCAL_INCLUDES += [
     "/tools/profiler/public"
 ]
 
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["UNICODE"] = True
-    DEFINES["_UNICODE"] = True
-
 Library("registered_field_trials_header_gn")
diff --git third_party/libwebrtc/logging/rtc_event_audio_gn/moz.build third_party/libwebrtc/logging/rtc_event_audio_gn/moz.build
index b19dfce9ec00..8f8f56f8ec46 100644
--- third_party/libwebrtc/logging/rtc_event_audio_gn/moz.build
+++ third_party/libwebrtc/logging/rtc_event_audio_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -52,97 +61,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -150,82 +69,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("rtc_event_audio_gn")
diff --git third_party/libwebrtc/logging/rtc_event_bwe_gn/moz.build third_party/libwebrtc/logging/rtc_event_bwe_gn/moz.build
index 76b92d1cf35b..ba4749c31163 100644
--- third_party/libwebrtc/logging/rtc_event_bwe_gn/moz.build
+++ third_party/libwebrtc/logging/rtc_event_bwe_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -53,97 +62,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -151,82 +70,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("rtc_event_bwe_gn")
diff --git third_party/libwebrtc/logging/rtc_event_bwe_update_scream_gn/moz.build third_party/libwebrtc/logging/rtc_event_bwe_update_scream_gn/moz.build
index 6f31b17e8fbc..32e10e5d013e 100644
--- third_party/libwebrtc/logging/rtc_event_bwe_update_scream_gn/moz.build
+++ third_party/libwebrtc/logging/rtc_event_bwe_update_scream_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("rtc_event_bwe_update_scream_gn")
diff --git third_party/libwebrtc/logging/rtc_event_field_gn/moz.build third_party/libwebrtc/logging/rtc_event_field_gn/moz.build
index 7644659b7240..8baab00c4233 100644
--- third_party/libwebrtc/logging/rtc_event_field_gn/moz.build
+++ third_party/libwebrtc/logging/rtc_event_field_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -54,97 +63,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -152,82 +71,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("rtc_event_field_gn")
diff --git third_party/libwebrtc/logging/rtc_event_log_parse_status_gn/moz.build third_party/libwebrtc/logging/rtc_event_log_parse_status_gn/moz.build
index 86a167f3d4d8..5643729249ed 100644
--- third_party/libwebrtc/logging/rtc_event_log_parse_status_gn/moz.build
+++ third_party/libwebrtc/logging/rtc_event_log_parse_status_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,86 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -159,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("rtc_event_log_parse_status_gn")
diff --git third_party/libwebrtc/logging/rtc_event_number_encodings_gn/moz.build third_party/libwebrtc/logging/rtc_event_number_encodings_gn/moz.build
index 8397e64b0233..a778ed60637b 100644
--- third_party/libwebrtc/logging/rtc_event_number_encodings_gn/moz.build
+++ third_party/libwebrtc/logging/rtc_event_number_encodings_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -50,86 +59,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -137,82 +67,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("rtc_event_number_encodings_gn")
diff --git third_party/libwebrtc/logging/rtc_event_pacing_gn/moz.build third_party/libwebrtc/logging/rtc_event_pacing_gn/moz.build
index 57c8efcfbcf1..21b21bf6a2db 100644
--- third_party/libwebrtc/logging/rtc_event_pacing_gn/moz.build
+++ third_party/libwebrtc/logging/rtc_event_pacing_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("rtc_event_pacing_gn")
diff --git third_party/libwebrtc/logging/rtc_event_rtp_rtcp_gn/moz.build third_party/libwebrtc/logging/rtc_event_rtp_rtcp_gn/moz.build
index a808050b6630..037b83b66196 100644
--- third_party/libwebrtc/logging/rtc_event_rtp_rtcp_gn/moz.build
+++ third_party/libwebrtc/logging/rtc_event_rtp_rtcp_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -51,97 +60,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -149,82 +68,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("rtc_event_rtp_rtcp_gn")
diff --git third_party/libwebrtc/logging/rtc_event_video_gn/moz.build third_party/libwebrtc/logging/rtc_event_video_gn/moz.build
index c1e79e4f2902..3733b864b8b3 100644
--- third_party/libwebrtc/logging/rtc_event_video_gn/moz.build
+++ third_party/libwebrtc/logging/rtc_event_video_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -49,97 +58,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -147,82 +66,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("rtc_event_video_gn")
diff --git third_party/libwebrtc/logging/rtc_stream_config_gn/moz.build third_party/libwebrtc/logging/rtc_stream_config_gn/moz.build
index 522a62cb2539..fac68611e545 100644
--- third_party/libwebrtc/logging/rtc_stream_config_gn/moz.build
+++ third_party/libwebrtc/logging/rtc_stream_config_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("rtc_stream_config_gn")
diff --git third_party/libwebrtc/media/audio_source_gn/moz.build third_party/libwebrtc/media/audio_source_gn/moz.build
index 4c2bdfdaa6c7..79e44916c998 100644
--- third_party/libwebrtc/media/audio_source_gn/moz.build
+++ third_party/libwebrtc/media/audio_source_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("audio_source_gn")
diff --git third_party/libwebrtc/media/codec_gn/moz.build third_party/libwebrtc/media/codec_gn/moz.build
index a6872fb50473..5b8181d72494 100644
--- third_party/libwebrtc/media/codec_gn/moz.build
+++ third_party/libwebrtc/media/codec_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -49,97 +58,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -147,82 +66,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("codec_gn")
diff --git third_party/libwebrtc/media/media_channel_gn/moz.build third_party/libwebrtc/media/media_channel_gn/moz.build
index 79bf4dd70750..698569235da2 100644
--- third_party/libwebrtc/media/media_channel_gn/moz.build
+++ third_party/libwebrtc/media/media_channel_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,98 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "GLESv2",
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -143,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -171,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("media_channel_gn")
diff --git third_party/libwebrtc/media/media_channel_impl_gn/moz.build third_party/libwebrtc/media/media_channel_impl_gn/moz.build
index 5d0354f77cec..edd7ed9e62b3 100644
--- third_party/libwebrtc/media/media_channel_impl_gn/moz.build
+++ third_party/libwebrtc/media/media_channel_impl_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("media_channel_impl_gn")
diff --git third_party/libwebrtc/media/media_constants_gn/moz.build third_party/libwebrtc/media/media_constants_gn/moz.build
index 4c92be9fcd8b..9885e0dd8fa1 100644
--- third_party/libwebrtc/media/media_constants_gn/moz.build
+++ third_party/libwebrtc/media/media_constants_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,82 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("media_constants_gn")
diff --git third_party/libwebrtc/media/media_engine_gn/moz.build third_party/libwebrtc/media/media_engine_gn/moz.build
index 2a24df795fc3..b28407d7f689 100644
--- third_party/libwebrtc/media/media_engine_gn/moz.build
+++ third_party/libwebrtc/media/media_engine_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,98 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "GLESv2",
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -143,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -171,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("media_engine_gn")
diff --git third_party/libwebrtc/media/rid_description_gn/moz.build third_party/libwebrtc/media/rid_description_gn/moz.build
index 409689fdd296..2bffdc8d0e23 100644
--- third_party/libwebrtc/media/rid_description_gn/moz.build
+++ third_party/libwebrtc/media/rid_description_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("rid_description_gn")
diff --git third_party/libwebrtc/media/rtc_audio_video_gn/moz.build third_party/libwebrtc/media/rtc_audio_video_gn/moz.build
index 81b969051ba0..703b747cfab5 100644
--- third_party/libwebrtc/media/rtc_audio_video_gn/moz.build
+++ third_party/libwebrtc/media/rtc_audio_video_gn/moz.build
@@ -14,14 +14,23 @@ DEFINES["HAVE_WEBRTC_VIDEO"] = True
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -50,102 +59,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "GLESv2",
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "ole32",
-        "oleaut32",
-        "secur32",
-        "strmiids",
-        "user32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -153,82 +67,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("rtc_audio_video_gn")
diff --git third_party/libwebrtc/media/rtc_internal_video_codecs_gn/moz.build third_party/libwebrtc/media/rtc_internal_video_codecs_gn/moz.build
index 5567a07d0268..6e461e5f9e50 100644
--- third_party/libwebrtc/media/rtc_internal_video_codecs_gn/moz.build
+++ third_party/libwebrtc/media/rtc_internal_video_codecs_gn/moz.build
@@ -14,14 +14,23 @@ DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
 DEFINES["RTC_USE_LIBAOM_AV1_ENCODER"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -49,97 +58,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -147,82 +66,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("rtc_internal_video_codecs_gn")
diff --git third_party/libwebrtc/media/rtc_media_config_gn/moz.build third_party/libwebrtc/media/rtc_media_config_gn/moz.build
index f72a7839e09c..b0413a0865bf 100644
--- third_party/libwebrtc/media/rtc_media_config_gn/moz.build
+++ third_party/libwebrtc/media/rtc_media_config_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("rtc_media_config_gn")
diff --git third_party/libwebrtc/media/rtc_media_gn/moz.build third_party/libwebrtc/media/rtc_media_gn/moz.build
index b3dba54ac39b..70fa36f7d8bd 100644
--- third_party/libwebrtc/media/rtc_media_gn/moz.build
+++ third_party/libwebrtc/media/rtc_media_gn/moz.build
@@ -14,14 +14,23 @@ DEFINES["HAVE_WEBRTC_VIDEO"] = True
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -45,102 +54,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "GLESv2",
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "ole32",
-        "oleaut32",
-        "secur32",
-        "strmiids",
-        "user32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -148,25 +62,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -176,40 +75,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("rtc_media_gn")
diff --git third_party/libwebrtc/media/rtc_sdp_video_format_utils_gn/moz.build third_party/libwebrtc/media/rtc_sdp_video_format_utils_gn/moz.build
index 197e283877c8..8f5fa2329b0e 100644
--- third_party/libwebrtc/media/rtc_sdp_video_format_utils_gn/moz.build
+++ third_party/libwebrtc/media/rtc_sdp_video_format_utils_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("rtc_sdp_video_format_utils_gn")
diff --git third_party/libwebrtc/media/rtc_simulcast_encoder_adapter_gn/moz.build third_party/libwebrtc/media/rtc_simulcast_encoder_adapter_gn/moz.build
index 73b972ed9ed3..b82e96e380d7 100644
--- third_party/libwebrtc/media/rtc_simulcast_encoder_adapter_gn/moz.build
+++ third_party/libwebrtc/media/rtc_simulcast_encoder_adapter_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("rtc_simulcast_encoder_adapter_gn")
diff --git third_party/libwebrtc/media/rtp_utils_gn/moz.build third_party/libwebrtc/media/rtp_utils_gn/moz.build
index 80c65d34e852..b96728d97e38 100644
--- third_party/libwebrtc/media/rtp_utils_gn/moz.build
+++ third_party/libwebrtc/media/rtp_utils_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("rtp_utils_gn")
diff --git third_party/libwebrtc/media/stream_params_gn/moz.build third_party/libwebrtc/media/stream_params_gn/moz.build
index 62c3fd133aee..47cd96bc7656 100644
--- third_party/libwebrtc/media/stream_params_gn/moz.build
+++ third_party/libwebrtc/media/stream_params_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("stream_params_gn")
diff --git third_party/libwebrtc/modules/async_audio_processing/async_audio_processing_gn/moz.build third_party/libwebrtc/modules/async_audio_processing/async_audio_processing_gn/moz.build
index 7a11c162953f..221e36e46327 100644
--- third_party/libwebrtc/modules/async_audio_processing/async_audio_processing_gn/moz.build
+++ third_party/libwebrtc/modules/async_audio_processing/async_audio_processing_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("async_audio_processing_gn")
diff --git third_party/libwebrtc/modules/audio_coding/audio_coding_gn/moz.build third_party/libwebrtc/modules/audio_coding/audio_coding_gn/moz.build
index ba7e39031075..a955c5a942b9 100644
--- third_party/libwebrtc/modules/audio_coding/audio_coding_gn/moz.build
+++ third_party/libwebrtc/modules/audio_coding/audio_coding_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -51,97 +60,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -149,82 +68,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("audio_coding_gn")
diff --git third_party/libwebrtc/modules/audio_coding/audio_coding_module_typedefs_gn/moz.build third_party/libwebrtc/modules/audio_coding/audio_coding_module_typedefs_gn/moz.build
index 722efc8b0200..00241b366087 100644
--- third_party/libwebrtc/modules/audio_coding/audio_coding_module_typedefs_gn/moz.build
+++ third_party/libwebrtc/modules/audio_coding/audio_coding_module_typedefs_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("audio_coding_module_typedefs_gn")
diff --git third_party/libwebrtc/modules/audio_coding/audio_coding_opus_common_gn/moz.build third_party/libwebrtc/modules/audio_coding/audio_coding_opus_common_gn/moz.build
index ab8cbb896833..e66f8afac101 100644
--- third_party/libwebrtc/modules/audio_coding/audio_coding_opus_common_gn/moz.build
+++ third_party/libwebrtc/modules/audio_coding/audio_coding_opus_common_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("audio_coding_opus_common_gn")
diff --git third_party/libwebrtc/modules/audio_coding/audio_encoder_cng_gn/moz.build third_party/libwebrtc/modules/audio_coding/audio_encoder_cng_gn/moz.build
index e384adb5b61a..5bc2f4c94870 100644
--- third_party/libwebrtc/modules/audio_coding/audio_encoder_cng_gn/moz.build
+++ third_party/libwebrtc/modules/audio_coding/audio_encoder_cng_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("audio_encoder_cng_gn")
diff --git third_party/libwebrtc/modules/audio_coding/audio_network_adaptor_config_gn/moz.build third_party/libwebrtc/modules/audio_coding/audio_network_adaptor_config_gn/moz.build
index 522c7ea9ef79..132e2a5c7e1f 100644
--- third_party/libwebrtc/modules/audio_coding/audio_network_adaptor_config_gn/moz.build
+++ third_party/libwebrtc/modules/audio_coding/audio_network_adaptor_config_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,82 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("audio_network_adaptor_config_gn")
diff --git third_party/libwebrtc/modules/audio_coding/audio_network_adaptor_gn/moz.build third_party/libwebrtc/modules/audio_coding/audio_network_adaptor_gn/moz.build
index a264060f5b20..c20a0920ec5e 100644
--- third_party/libwebrtc/modules/audio_coding/audio_network_adaptor_gn/moz.build
+++ third_party/libwebrtc/modules/audio_coding/audio_network_adaptor_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -58,97 +67,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -156,82 +75,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("audio_network_adaptor_gn")
diff --git third_party/libwebrtc/modules/audio_coding/g711_c_gn/moz.build third_party/libwebrtc/modules/audio_coding/g711_c_gn/moz.build
index 1a992295efab..d508e963ae4d 100644
--- third_party/libwebrtc/modules/audio_coding/g711_c_gn/moz.build
+++ third_party/libwebrtc/modules/audio_coding/g711_c_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,82 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
-    CFLAGS += [
-        "-msse2"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
     CFLAGS += [
         "-msse2"
     ]
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("g711_c_gn")
diff --git third_party/libwebrtc/modules/audio_coding/g711_gn/moz.build third_party/libwebrtc/modules/audio_coding/g711_gn/moz.build
index 89aaefd484c8..470b91fff910 100644
--- third_party/libwebrtc/modules/audio_coding/g711_gn/moz.build
+++ third_party/libwebrtc/modules/audio_coding/g711_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -49,97 +58,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -147,82 +66,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("g711_gn")
diff --git third_party/libwebrtc/modules/audio_coding/g722_c_gn/moz.build third_party/libwebrtc/modules/audio_coding/g722_c_gn/moz.build
index fb4748972ff7..5d22e92c4d53 100644
--- third_party/libwebrtc/modules/audio_coding/g722_c_gn/moz.build
+++ third_party/libwebrtc/modules/audio_coding/g722_c_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,82 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
-    CFLAGS += [
-        "-msse2"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
     CFLAGS += [
         "-msse2"
     ]
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("g722_c_gn")
diff --git third_party/libwebrtc/modules/audio_coding/g722_gn/moz.build third_party/libwebrtc/modules/audio_coding/g722_gn/moz.build
index 27b94ef358fb..9a80fe5b41c5 100644
--- third_party/libwebrtc/modules/audio_coding/g722_gn/moz.build
+++ third_party/libwebrtc/modules/audio_coding/g722_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -49,97 +58,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -147,82 +66,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("g722_gn")
diff --git third_party/libwebrtc/modules/audio_coding/isac_bwinfo_gn/moz.build third_party/libwebrtc/modules/audio_coding/isac_bwinfo_gn/moz.build
index 9fbab3653d81..7364e659e1b4 100644
--- third_party/libwebrtc/modules/audio_coding/isac_bwinfo_gn/moz.build
+++ third_party/libwebrtc/modules/audio_coding/isac_bwinfo_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("isac_bwinfo_gn")
diff --git third_party/libwebrtc/modules/audio_coding/isac_vad_gn/moz.build third_party/libwebrtc/modules/audio_coding/isac_vad_gn/moz.build
index 112d99f5aad5..0902263be83c 100644
--- third_party/libwebrtc/modules/audio_coding/isac_vad_gn/moz.build
+++ third_party/libwebrtc/modules/audio_coding/isac_vad_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -51,82 +60,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -134,82 +68,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
-    CFLAGS += [
-        "-msse2"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
     CFLAGS += [
         "-msse2"
     ]
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("isac_vad_gn")
diff --git third_party/libwebrtc/modules/audio_coding/legacy_encoded_audio_frame_gn/moz.build third_party/libwebrtc/modules/audio_coding/legacy_encoded_audio_frame_gn/moz.build
index 4cb60bc70943..5fb95e4550c6 100644
--- third_party/libwebrtc/modules/audio_coding/legacy_encoded_audio_frame_gn/moz.build
+++ third_party/libwebrtc/modules/audio_coding/legacy_encoded_audio_frame_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("legacy_encoded_audio_frame_gn")
diff --git third_party/libwebrtc/modules/audio_coding/neteq_gn/moz.build third_party/libwebrtc/modules/audio_coding/neteq_gn/moz.build
index 12f50213ae6c..bbb94c7f1085 100644
--- third_party/libwebrtc/modules/audio_coding/neteq_gn/moz.build
+++ third_party/libwebrtc/modules/audio_coding/neteq_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -82,97 +91,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -180,82 +99,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("neteq_gn")
diff --git third_party/libwebrtc/modules/audio_coding/pcm16b_c_gn/moz.build third_party/libwebrtc/modules/audio_coding/pcm16b_c_gn/moz.build
index 39d082a239ee..b7c0efa1f9ed 100644
--- third_party/libwebrtc/modules/audio_coding/pcm16b_c_gn/moz.build
+++ third_party/libwebrtc/modules/audio_coding/pcm16b_c_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,82 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
-    CFLAGS += [
-        "-msse2"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
     CFLAGS += [
         "-msse2"
     ]
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("pcm16b_c_gn")
diff --git third_party/libwebrtc/modules/audio_coding/pcm16b_gn/moz.build third_party/libwebrtc/modules/audio_coding/pcm16b_gn/moz.build
index 364ab6d2c5c6..9bed6b34a982 100644
--- third_party/libwebrtc/modules/audio_coding/pcm16b_gn/moz.build
+++ third_party/libwebrtc/modules/audio_coding/pcm16b_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -50,97 +59,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -148,82 +67,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("pcm16b_gn")
diff --git third_party/libwebrtc/modules/audio_coding/red_gn/moz.build third_party/libwebrtc/modules/audio_coding/red_gn/moz.build
index 1269e6a23955..bf458d5e85b2 100644
--- third_party/libwebrtc/modules/audio_coding/red_gn/moz.build
+++ third_party/libwebrtc/modules/audio_coding/red_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("red_gn")
diff --git third_party/libwebrtc/modules/audio_coding/webrtc_cng_gn/moz.build third_party/libwebrtc/modules/audio_coding/webrtc_cng_gn/moz.build
index eab9673aff2b..0ede5f27094b 100644
--- third_party/libwebrtc/modules/audio_coding/webrtc_cng_gn/moz.build
+++ third_party/libwebrtc/modules/audio_coding/webrtc_cng_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("webrtc_cng_gn")
diff --git third_party/libwebrtc/modules/audio_coding/webrtc_multiopus_gn/moz.build third_party/libwebrtc/modules/audio_coding/webrtc_multiopus_gn/moz.build
index 9856fb864f07..4c57d84d7f27 100644
--- third_party/libwebrtc/modules/audio_coding/webrtc_multiopus_gn/moz.build
+++ third_party/libwebrtc/modules/audio_coding/webrtc_multiopus_gn/moz.build
@@ -13,6 +13,9 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_CODEC_OPUS"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
@@ -21,8 +24,14 @@ DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
 DEFINES["WEBRTC_OPUS_SUPPORT_120MS_PTIME"] = "1"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -52,97 +61,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -150,82 +69,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("webrtc_multiopus_gn")
diff --git third_party/libwebrtc/modules/audio_coding/webrtc_opus_gn/moz.build third_party/libwebrtc/modules/audio_coding/webrtc_opus_gn/moz.build
index 490ccbdf4720..ce7d64069c19 100644
--- third_party/libwebrtc/modules/audio_coding/webrtc_opus_gn/moz.build
+++ third_party/libwebrtc/modules/audio_coding/webrtc_opus_gn/moz.build
@@ -13,6 +13,9 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_CODEC_OPUS"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
@@ -21,8 +24,14 @@ DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
 DEFINES["WEBRTC_OPUS_SUPPORT_120MS_PTIME"] = "1"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -52,97 +61,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -150,82 +69,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("webrtc_opus_gn")
diff --git third_party/libwebrtc/modules/audio_coding/webrtc_opus_wrapper_gn/moz.build third_party/libwebrtc/modules/audio_coding/webrtc_opus_wrapper_gn/moz.build
index 08da67cf02ea..a48d3a028268 100644
--- third_party/libwebrtc/modules/audio_coding/webrtc_opus_wrapper_gn/moz.build
+++ third_party/libwebrtc/modules/audio_coding/webrtc_opus_wrapper_gn/moz.build
@@ -13,6 +13,9 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_CODEC_OPUS"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
@@ -21,8 +24,14 @@ DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
 DEFINES["WEBRTC_OPUS_SUPPORT_120MS_PTIME"] = "1"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -51,86 +60,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -138,82 +68,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("webrtc_opus_wrapper_gn")
diff --git third_party/libwebrtc/modules/audio_device/audio_device_gn/moz.build third_party/libwebrtc/modules/audio_device/audio_device_gn/moz.build
index 97bfcb4d05f5..5a937aac3f8d 100644
--- third_party/libwebrtc/modules/audio_device/audio_device_gn/moz.build
+++ third_party/libwebrtc/modules/audio_device/audio_device_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("audio_device_gn")
diff --git third_party/libwebrtc/modules/audio_mixer/audio_frame_manipulator_gn/moz.build third_party/libwebrtc/modules/audio_mixer/audio_frame_manipulator_gn/moz.build
index 0dee46d09b0c..34057dab7368 100644
--- third_party/libwebrtc/modules/audio_mixer/audio_frame_manipulator_gn/moz.build
+++ third_party/libwebrtc/modules/audio_mixer/audio_frame_manipulator_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("audio_frame_manipulator_gn")
diff --git third_party/libwebrtc/modules/audio_mixer/audio_mixer_impl_gn/moz.build third_party/libwebrtc/modules/audio_mixer/audio_mixer_impl_gn/moz.build
index 20ef755d5af6..ae20626d0e52 100644
--- third_party/libwebrtc/modules/audio_mixer/audio_mixer_impl_gn/moz.build
+++ third_party/libwebrtc/modules/audio_mixer/audio_mixer_impl_gn/moz.build
@@ -13,15 +13,24 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
 DEFINES["WEBRTC_APM_DEBUG_DUMP"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -51,97 +60,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -149,82 +68,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("audio_mixer_impl_gn")
diff --git third_party/libwebrtc/modules/audio_processing/aec3/adaptive_fir_filter_erl_gn/moz.build third_party/libwebrtc/modules/audio_processing/aec3/adaptive_fir_filter_erl_gn/moz.build
index 03957cec05c2..a6ae94c83115 100644
--- third_party/libwebrtc/modules/audio_processing/aec3/adaptive_fir_filter_erl_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/aec3/adaptive_fir_filter_erl_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("adaptive_fir_filter_erl_gn")
diff --git third_party/libwebrtc/modules/audio_processing/aec3/adaptive_fir_filter_gn/moz.build third_party/libwebrtc/modules/audio_processing/aec3/adaptive_fir_filter_gn/moz.build
index 046494fdc8a6..2f84940c3736 100644
--- third_party/libwebrtc/modules/audio_processing/aec3/adaptive_fir_filter_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/aec3/adaptive_fir_filter_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,97 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -170,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("adaptive_fir_filter_gn")
diff --git third_party/libwebrtc/modules/audio_processing/aec3/aec3_avx2_gn/moz.build third_party/libwebrtc/modules/audio_processing/aec3/aec3_avx2_gn/moz.build
index 67090428e623..5512d06e362b 100644
--- third_party/libwebrtc/modules/audio_processing/aec3/aec3_avx2_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/aec3/aec3_avx2_gn/moz.build
@@ -18,7 +18,10 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
 DEFINES["WEBRTC_APM_DEBUG_DUMP"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_AVX2"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
@@ -26,8 +29,14 @@ DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -59,126 +68,9 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
     DEFINES["_DEBUG"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
+if CONFIG["TARGET_CPU"] == "x86":
 
     CXXFLAGS += [
         "-msse2"
diff --git third_party/libwebrtc/modules/audio_processing/aec3/aec3_block_gn/moz.build third_party/libwebrtc/modules/audio_processing/aec3/aec3_block_gn/moz.build
index f0c91fafe69b..2c83822d5ff1 100644
--- third_party/libwebrtc/modules/audio_processing/aec3/aec3_block_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/aec3/aec3_block_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("aec3_block_gn")
diff --git third_party/libwebrtc/modules/audio_processing/aec3/aec3_common_gn/moz.build third_party/libwebrtc/modules/audio_processing/aec3/aec3_common_gn/moz.build
index a6e76f3e95bd..8b9677b91a3d 100644
--- third_party/libwebrtc/modules/audio_processing/aec3/aec3_common_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/aec3/aec3_common_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("aec3_common_gn")
diff --git third_party/libwebrtc/modules/audio_processing/aec3/aec3_fft_gn/moz.build third_party/libwebrtc/modules/audio_processing/aec3/aec3_fft_gn/moz.build
index 9b660092c059..16dfeff47cef 100644
--- third_party/libwebrtc/modules/audio_processing/aec3/aec3_fft_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/aec3/aec3_fft_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,97 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -170,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("aec3_fft_gn")
diff --git third_party/libwebrtc/modules/audio_processing/aec3/aec3_gn/moz.build third_party/libwebrtc/modules/audio_processing/aec3/aec3_gn/moz.build
index c999591b3efd..f0cd3ab06e8d 100644
--- third_party/libwebrtc/modules/audio_processing/aec3/aec3_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/aec3/aec3_gn/moz.build
@@ -13,15 +13,24 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
 DEFINES["WEBRTC_APM_DEBUG_DUMP"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -105,97 +114,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -203,82 +122,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("aec3_gn")
diff --git third_party/libwebrtc/modules/audio_processing/aec3/fft_data_gn/moz.build third_party/libwebrtc/modules/audio_processing/aec3/fft_data_gn/moz.build
index d64c9bcb1532..e87b9e1f8a18 100644
--- third_party/libwebrtc/modules/audio_processing/aec3/fft_data_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/aec3/fft_data_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,86 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -159,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("fft_data_gn")
diff --git third_party/libwebrtc/modules/audio_processing/aec3/matched_filter_gn/moz.build third_party/libwebrtc/modules/audio_processing/aec3/matched_filter_gn/moz.build
index 0c849e11d13c..bcc434fb7b10 100644
--- third_party/libwebrtc/modules/audio_processing/aec3/matched_filter_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/aec3/matched_filter_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("matched_filter_gn")
diff --git third_party/libwebrtc/modules/audio_processing/aec3/render_buffer_gn/moz.build third_party/libwebrtc/modules/audio_processing/aec3/render_buffer_gn/moz.build
index a2ed71948c0a..909ceef00db9 100644
--- third_party/libwebrtc/modules/audio_processing/aec3/render_buffer_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/aec3/render_buffer_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,86 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -159,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("render_buffer_gn")
diff --git third_party/libwebrtc/modules/audio_processing/aec3/vector_math_gn/moz.build third_party/libwebrtc/modules/audio_processing/aec3/vector_math_gn/moz.build
index aef86755156f..326b7add0c74 100644
--- third_party/libwebrtc/modules/audio_processing/aec3/vector_math_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/aec3/vector_math_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,86 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -159,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("vector_math_gn")
diff --git third_party/libwebrtc/modules/audio_processing/aec_dump/aec_dump_gn/moz.build third_party/libwebrtc/modules/audio_processing/aec_dump/aec_dump_gn/moz.build
index 292fabcb91de..04be096ab3ac 100644
--- third_party/libwebrtc/modules/audio_processing/aec_dump/aec_dump_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/aec_dump/aec_dump_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,97 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -170,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("aec_dump_gn")
diff --git third_party/libwebrtc/modules/audio_processing/aec_dump/null_aec_dump_factory_gn/moz.build third_party/libwebrtc/modules/audio_processing/aec_dump/null_aec_dump_factory_gn/moz.build
index 608305d56245..cf53ad2abc66 100644
--- third_party/libwebrtc/modules/audio_processing/aec_dump/null_aec_dump_factory_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/aec_dump/null_aec_dump_factory_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("null_aec_dump_factory_gn")
diff --git third_party/libwebrtc/modules/audio_processing/aec_dump_interface_gn/moz.build third_party/libwebrtc/modules/audio_processing/aec_dump_interface_gn/moz.build
index 6125d9c60b61..ff2d4c7ce7a3 100644
--- third_party/libwebrtc/modules/audio_processing/aec_dump_interface_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/aec_dump_interface_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("aec_dump_interface_gn")
diff --git third_party/libwebrtc/modules/audio_processing/agc/agc_gn/moz.build third_party/libwebrtc/modules/audio_processing/agc/agc_gn/moz.build
index a143ddee7168..317a8c45a5b1 100644
--- third_party/libwebrtc/modules/audio_processing/agc/agc_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/agc/agc_gn/moz.build
@@ -13,15 +13,24 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
 DEFINES["WEBRTC_APM_DEBUG_DUMP"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -49,97 +58,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -147,82 +66,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("agc_gn")
diff --git third_party/libwebrtc/modules/audio_processing/agc/gain_control_interface_gn/moz.build third_party/libwebrtc/modules/audio_processing/agc/gain_control_interface_gn/moz.build
index 606258d27c0b..73c6c48ff4b6 100644
--- third_party/libwebrtc/modules/audio_processing/agc/gain_control_interface_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/agc/gain_control_interface_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("gain_control_interface_gn")
diff --git third_party/libwebrtc/modules/audio_processing/agc/legacy_agc_gn/moz.build third_party/libwebrtc/modules/audio_processing/agc/legacy_agc_gn/moz.build
index 51cb949aee16..38d134268d3f 100644
--- third_party/libwebrtc/modules/audio_processing/agc/legacy_agc_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/agc/legacy_agc_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -49,86 +58,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -136,82 +66,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("legacy_agc_gn")
diff --git third_party/libwebrtc/modules/audio_processing/agc/level_estimation_gn/moz.build third_party/libwebrtc/modules/audio_processing/agc/level_estimation_gn/moz.build
index fcc44d437d09..64dcd1164999 100644
--- third_party/libwebrtc/modules/audio_processing/agc/level_estimation_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/agc/level_estimation_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -50,97 +59,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -148,82 +67,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("level_estimation_gn")
diff --git third_party/libwebrtc/modules/audio_processing/agc2/adaptive_digital_gain_controller_gn/moz.build third_party/libwebrtc/modules/audio_processing/agc2/adaptive_digital_gain_controller_gn/moz.build
index 78aa4a619902..d10e55e60441 100644
--- third_party/libwebrtc/modules/audio_processing/agc2/adaptive_digital_gain_controller_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/agc2/adaptive_digital_gain_controller_gn/moz.build
@@ -13,15 +13,24 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
 DEFINES["WEBRTC_APM_DEBUG_DUMP"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -49,97 +58,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -147,82 +66,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("adaptive_digital_gain_controller_gn")
diff --git third_party/libwebrtc/modules/audio_processing/agc2/biquad_filter_gn/moz.build third_party/libwebrtc/modules/audio_processing/agc2/biquad_filter_gn/moz.build
index 99ba2455db8a..e2d4ec3c4533 100644
--- third_party/libwebrtc/modules/audio_processing/agc2/biquad_filter_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/agc2/biquad_filter_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("biquad_filter_gn")
diff --git third_party/libwebrtc/modules/audio_processing/agc2/clipping_predictor_gn/moz.build third_party/libwebrtc/modules/audio_processing/agc2/clipping_predictor_gn/moz.build
index 118e285f3fcd..9e554b38ad26 100644
--- third_party/libwebrtc/modules/audio_processing/agc2/clipping_predictor_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/agc2/clipping_predictor_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -49,97 +58,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -147,82 +66,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("clipping_predictor_gn")
diff --git third_party/libwebrtc/modules/audio_processing/agc2/common_gn/moz.build third_party/libwebrtc/modules/audio_processing/agc2/common_gn/moz.build
index 4b8322370004..dd272bb41b33 100644
--- third_party/libwebrtc/modules/audio_processing/agc2/common_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/agc2/common_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("common_gn")
diff --git third_party/libwebrtc/modules/audio_processing/agc2/cpu_features_gn/moz.build third_party/libwebrtc/modules/audio_processing/agc2/cpu_features_gn/moz.build
index f504c14331be..8aa6ee42c90d 100644
--- third_party/libwebrtc/modules/audio_processing/agc2/cpu_features_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/agc2/cpu_features_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("cpu_features_gn")
diff --git third_party/libwebrtc/modules/audio_processing/agc2/fixed_digital_gn/moz.build third_party/libwebrtc/modules/audio_processing/agc2/fixed_digital_gn/moz.build
index 4392e58b6831..6feaf001a5ef 100644
--- third_party/libwebrtc/modules/audio_processing/agc2/fixed_digital_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/agc2/fixed_digital_gn/moz.build
@@ -13,15 +13,24 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
 DEFINES["WEBRTC_APM_DEBUG_DUMP"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -51,97 +60,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -149,82 +68,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("fixed_digital_gn")
diff --git third_party/libwebrtc/modules/audio_processing/agc2/gain_applier_gn/moz.build third_party/libwebrtc/modules/audio_processing/agc2/gain_applier_gn/moz.build
index e0faa2344e3b..b02743c3766c 100644
--- third_party/libwebrtc/modules/audio_processing/agc2/gain_applier_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/agc2/gain_applier_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("gain_applier_gn")
diff --git third_party/libwebrtc/modules/audio_processing/agc2/gain_map_gn/moz.build third_party/libwebrtc/modules/audio_processing/agc2/gain_map_gn/moz.build
index ee1995ad8e55..7288dadad6e7 100644
--- third_party/libwebrtc/modules/audio_processing/agc2/gain_map_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/agc2/gain_map_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("gain_map_gn")
diff --git third_party/libwebrtc/modules/audio_processing/agc2/input_volume_controller_gn/moz.build third_party/libwebrtc/modules/audio_processing/agc2/input_volume_controller_gn/moz.build
index d3afebd7f539..8cd69975f256 100644
--- third_party/libwebrtc/modules/audio_processing/agc2/input_volume_controller_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/agc2/input_volume_controller_gn/moz.build
@@ -13,15 +13,24 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
 DEFINES["WEBRTC_APM_DEBUG_DUMP"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -50,97 +59,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -148,82 +67,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("input_volume_controller_gn")
diff --git third_party/libwebrtc/modules/audio_processing/agc2/input_volume_stats_reporter_gn/moz.build third_party/libwebrtc/modules/audio_processing/agc2/input_volume_stats_reporter_gn/moz.build
index 709d86d6c68d..079066bab3bf 100644
--- third_party/libwebrtc/modules/audio_processing/agc2/input_volume_stats_reporter_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/agc2/input_volume_stats_reporter_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("input_volume_stats_reporter_gn")
diff --git third_party/libwebrtc/modules/audio_processing/agc2/noise_level_estimator_gn/moz.build third_party/libwebrtc/modules/audio_processing/agc2/noise_level_estimator_gn/moz.build
index 3258c24c258e..287cf0ac5ef2 100644
--- third_party/libwebrtc/modules/audio_processing/agc2/noise_level_estimator_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/agc2/noise_level_estimator_gn/moz.build
@@ -13,15 +13,24 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
 DEFINES["WEBRTC_APM_DEBUG_DUMP"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -49,97 +58,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -147,82 +66,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("noise_level_estimator_gn")
diff --git third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/rnn_vad_auto_correlation_gn/moz.build third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/rnn_vad_auto_correlation_gn/moz.build
index 8d7b88255419..c8f7a364c3e6 100644
--- third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/rnn_vad_auto_correlation_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/rnn_vad_auto_correlation_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("rnn_vad_auto_correlation_gn")
diff --git third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/rnn_vad_common_gn/moz.build third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/rnn_vad_common_gn/moz.build
index 710f64d39ba5..e4efb7686551 100644
--- third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/rnn_vad_common_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/rnn_vad_common_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,97 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -170,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("rnn_vad_common_gn")
diff --git third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/rnn_vad_gn/moz.build third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/rnn_vad_gn/moz.build
index 88ce1ec86284..7c81c4edf790 100644
--- third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/rnn_vad_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/rnn_vad_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -49,97 +58,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -147,82 +66,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("rnn_vad_gn")
diff --git third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/rnn_vad_layers_gn/moz.build third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/rnn_vad_layers_gn/moz.build
index a86353ce95b3..6e50a78844bd 100644
--- third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/rnn_vad_layers_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/rnn_vad_layers_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -49,97 +58,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -147,82 +66,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("rnn_vad_layers_gn")
diff --git third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/rnn_vad_lp_residual_gn/moz.build third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/rnn_vad_lp_residual_gn/moz.build
index f79397a1dabb..d3c3c0e3defe 100644
--- third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/rnn_vad_lp_residual_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/rnn_vad_lp_residual_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("rnn_vad_lp_residual_gn")
diff --git third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/rnn_vad_pitch_gn/moz.build third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/rnn_vad_pitch_gn/moz.build
index 3c6c568d725c..64ce8641230e 100644
--- third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/rnn_vad_pitch_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/rnn_vad_pitch_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -49,97 +58,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -147,82 +66,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("rnn_vad_pitch_gn")
diff --git third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/rnn_vad_ring_buffer_gn/moz.build third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/rnn_vad_ring_buffer_gn/moz.build
index 7ce28941438e..6784f7daa64d 100644
--- third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/rnn_vad_ring_buffer_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/rnn_vad_ring_buffer_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,86 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -159,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("rnn_vad_ring_buffer_gn")
diff --git third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/rnn_vad_sequence_buffer_gn/moz.build third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/rnn_vad_sequence_buffer_gn/moz.build
index d2451049abd4..19ea5b6a278d 100644
--- third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/rnn_vad_sequence_buffer_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/rnn_vad_sequence_buffer_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,86 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -159,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("rnn_vad_sequence_buffer_gn")
diff --git third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/rnn_vad_spectral_features_gn/moz.build third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/rnn_vad_spectral_features_gn/moz.build
index 5e57f1b870fe..b3ff14e94870 100644
--- third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/rnn_vad_spectral_features_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/rnn_vad_spectral_features_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -49,97 +58,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -147,82 +66,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("rnn_vad_spectral_features_gn")
diff --git third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/rnn_vad_symmetric_matrix_buffer_gn/moz.build third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/rnn_vad_symmetric_matrix_buffer_gn/moz.build
index f61cd4d2361d..021c251345f1 100644
--- third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/rnn_vad_symmetric_matrix_buffer_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/rnn_vad_symmetric_matrix_buffer_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,86 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -159,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("rnn_vad_symmetric_matrix_buffer_gn")
diff --git third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/vector_math_avx2_gn/moz.build third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/vector_math_avx2_gn/moz.build
index 858b40b74ad0..4b5361776f81 100644
--- third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/vector_math_avx2_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/vector_math_avx2_gn/moz.build
@@ -18,6 +18,9 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_AVX2"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
@@ -25,8 +28,14 @@ DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -54,126 +63,9 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
     DEFINES["_DEBUG"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
+if CONFIG["TARGET_CPU"] == "x86":
 
     CXXFLAGS += [
         "-msse2"
diff --git third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/vector_math_gn/moz.build third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/vector_math_gn/moz.build
index 6f11f270420d..326b7add0c74 100644
--- third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/vector_math_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/vector_math_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,97 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -170,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("vector_math_gn")
diff --git third_party/libwebrtc/modules/audio_processing/agc2/saturation_protector_gn/moz.build third_party/libwebrtc/modules/audio_processing/agc2/saturation_protector_gn/moz.build
index e2153794ed92..60f454df56d4 100644
--- third_party/libwebrtc/modules/audio_processing/agc2/saturation_protector_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/agc2/saturation_protector_gn/moz.build
@@ -13,15 +13,24 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
 DEFINES["WEBRTC_APM_DEBUG_DUMP"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -50,97 +59,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -148,82 +67,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("saturation_protector_gn")
diff --git third_party/libwebrtc/modules/audio_processing/agc2/speech_level_estimator_gn/moz.build third_party/libwebrtc/modules/audio_processing/agc2/speech_level_estimator_gn/moz.build
index 0fc41b52581b..592c30ca1054 100644
--- third_party/libwebrtc/modules/audio_processing/agc2/speech_level_estimator_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/agc2/speech_level_estimator_gn/moz.build
@@ -13,15 +13,24 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
 DEFINES["WEBRTC_APM_DEBUG_DUMP"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -54,97 +63,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -152,82 +71,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("speech_level_estimator_gn")
diff --git third_party/libwebrtc/modules/audio_processing/agc2/vad_wrapper_gn/moz.build third_party/libwebrtc/modules/audio_processing/agc2/vad_wrapper_gn/moz.build
index c35edac713f2..68c22021d0dd 100644
--- third_party/libwebrtc/modules/audio_processing/agc2/vad_wrapper_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/agc2/vad_wrapper_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("vad_wrapper_gn")
diff --git third_party/libwebrtc/modules/audio_processing/apm_logging_gn/moz.build third_party/libwebrtc/modules/audio_processing/apm_logging_gn/moz.build
index c003232f7f08..8a2131b77190 100644
--- third_party/libwebrtc/modules/audio_processing/apm_logging_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/apm_logging_gn/moz.build
@@ -13,15 +13,24 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
 DEFINES["WEBRTC_APM_DEBUG_DUMP"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -49,97 +58,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -147,82 +66,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("apm_logging_gn")
diff --git third_party/libwebrtc/modules/audio_processing/audio_buffer_gn/moz.build third_party/libwebrtc/modules/audio_processing/audio_buffer_gn/moz.build
index e1bc6e03ed14..02c4c41f7326 100644
--- third_party/libwebrtc/modules/audio_processing/audio_buffer_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/audio_buffer_gn/moz.build
@@ -13,15 +13,24 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
 DEFINES["WEBRTC_APM_DEBUG_DUMP"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -51,97 +60,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -149,82 +68,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("audio_buffer_gn")
diff --git third_party/libwebrtc/modules/audio_processing/audio_frame_proxies_gn/moz.build third_party/libwebrtc/modules/audio_processing/audio_frame_proxies_gn/moz.build
index fb0b27045c63..6ae2c8310e75 100644
--- third_party/libwebrtc/modules/audio_processing/audio_frame_proxies_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/audio_frame_proxies_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("audio_frame_proxies_gn")
diff --git third_party/libwebrtc/modules/audio_processing/audio_frame_view_gn/moz.build third_party/libwebrtc/modules/audio_processing/audio_frame_view_gn/moz.build
index 46e1299eed4d..857568a4668c 100644
--- third_party/libwebrtc/modules/audio_processing/audio_frame_view_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/audio_frame_view_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,97 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -170,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("audio_frame_view_gn")
diff --git third_party/libwebrtc/modules/audio_processing/audio_processing_gn/moz.build third_party/libwebrtc/modules/audio_processing/audio_processing_gn/moz.build
index 8bdf7fe28643..eef4b5617199 100644
--- third_party/libwebrtc/modules/audio_processing/audio_processing_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/audio_processing_gn/moz.build
@@ -13,15 +13,24 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
 DEFINES["WEBRTC_APM_DEBUG_DUMP"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -53,97 +62,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -151,82 +70,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("audio_processing_gn")
diff --git third_party/libwebrtc/modules/audio_processing/capture_levels_adjuster/capture_levels_adjuster_gn/moz.build third_party/libwebrtc/modules/audio_processing/capture_levels_adjuster/capture_levels_adjuster_gn/moz.build
index 4fe0e5511faa..eb3072330962 100644
--- third_party/libwebrtc/modules/audio_processing/capture_levels_adjuster/capture_levels_adjuster_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/capture_levels_adjuster/capture_levels_adjuster_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -49,97 +58,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -147,82 +66,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("capture_levels_adjuster_gn")
diff --git third_party/libwebrtc/modules/audio_processing/capture_mixer/capture_mixer_gn/moz.build third_party/libwebrtc/modules/audio_processing/capture_mixer/capture_mixer_gn/moz.build
index cf60247273d5..c2f4e14d1b89 100644
--- third_party/libwebrtc/modules/audio_processing/capture_mixer/capture_mixer_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/capture_mixer/capture_mixer_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -54,86 +63,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -141,82 +71,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("capture_mixer_gn")
diff --git third_party/libwebrtc/modules/audio_processing/gain_controller2_gn/moz.build third_party/libwebrtc/modules/audio_processing/gain_controller2_gn/moz.build
index 11c3f574c68d..b71e262c7460 100644
--- third_party/libwebrtc/modules/audio_processing/gain_controller2_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/gain_controller2_gn/moz.build
@@ -13,15 +13,24 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
 DEFINES["WEBRTC_APM_DEBUG_DUMP"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -49,97 +58,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -147,82 +66,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("gain_controller2_gn")
diff --git third_party/libwebrtc/modules/audio_processing/high_pass_filter_gn/moz.build third_party/libwebrtc/modules/audio_processing/high_pass_filter_gn/moz.build
index 1ce7bcb103db..df9c7629d869 100644
--- third_party/libwebrtc/modules/audio_processing/high_pass_filter_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/high_pass_filter_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("high_pass_filter_gn")
diff --git third_party/libwebrtc/modules/audio_processing/ns/ns_gn/moz.build third_party/libwebrtc/modules/audio_processing/ns/ns_gn/moz.build
index 31a479108f85..3e473c343d05 100644
--- third_party/libwebrtc/modules/audio_processing/ns/ns_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/ns/ns_gn/moz.build
@@ -13,15 +13,24 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
 DEFINES["WEBRTC_APM_DEBUG_DUMP"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -61,97 +70,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -159,82 +78,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("ns_gn")
diff --git third_party/libwebrtc/modules/audio_processing/post_filter_gn/moz.build third_party/libwebrtc/modules/audio_processing/post_filter_gn/moz.build
index 3e398cc8eed2..745762830ad0 100644
--- third_party/libwebrtc/modules/audio_processing/post_filter_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/post_filter_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("post_filter_gn")
diff --git third_party/libwebrtc/modules/audio_processing/rms_level_gn/moz.build third_party/libwebrtc/modules/audio_processing/rms_level_gn/moz.build
index 555616cb20a9..d62a275bcbf8 100644
--- third_party/libwebrtc/modules/audio_processing/rms_level_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/rms_level_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("rms_level_gn")
diff --git third_party/libwebrtc/modules/audio_processing/utility/cascaded_biquad_filter_gn/moz.build third_party/libwebrtc/modules/audio_processing/utility/cascaded_biquad_filter_gn/moz.build
index 0fd82daffd1e..4d4bf1b945ee 100644
--- third_party/libwebrtc/modules/audio_processing/utility/cascaded_biquad_filter_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/utility/cascaded_biquad_filter_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("cascaded_biquad_filter_gn")
diff --git third_party/libwebrtc/modules/audio_processing/utility/pffft_wrapper_gn/moz.build third_party/libwebrtc/modules/audio_processing/utility/pffft_wrapper_gn/moz.build
index 07c65021eee6..bf59fc04d49d 100644
--- third_party/libwebrtc/modules/audio_processing/utility/pffft_wrapper_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/utility/pffft_wrapper_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("pffft_wrapper_gn")
diff --git third_party/libwebrtc/modules/audio_processing/vad/vad_gn/moz.build third_party/libwebrtc/modules/audio_processing/vad/vad_gn/moz.build
index e7c8e759af55..7304da27c426 100644
--- third_party/libwebrtc/modules/audio_processing/vad/vad_gn/moz.build
+++ third_party/libwebrtc/modules/audio_processing/vad/vad_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -55,97 +64,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -153,82 +72,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("vad_gn")
diff --git third_party/libwebrtc/modules/congestion_controller/congestion_controller_gn/moz.build third_party/libwebrtc/modules/congestion_controller/congestion_controller_gn/moz.build
index 198263a53a2e..611f1235dc0e 100644
--- third_party/libwebrtc/modules/congestion_controller/congestion_controller_gn/moz.build
+++ third_party/libwebrtc/modules/congestion_controller/congestion_controller_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -49,97 +58,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -147,82 +66,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("congestion_controller_gn")
diff --git third_party/libwebrtc/modules/congestion_controller/goog_cc/alr_detector_gn/moz.build third_party/libwebrtc/modules/congestion_controller/goog_cc/alr_detector_gn/moz.build
index 1176a2e12376..b9044ed77703 100644
--- third_party/libwebrtc/modules/congestion_controller/goog_cc/alr_detector_gn/moz.build
+++ third_party/libwebrtc/modules/congestion_controller/goog_cc/alr_detector_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("alr_detector_gn")
diff --git third_party/libwebrtc/modules/congestion_controller/goog_cc/delay_based_bwe_gn/moz.build third_party/libwebrtc/modules/congestion_controller/goog_cc/delay_based_bwe_gn/moz.build
index dc5507f718b6..d1e139058df9 100644
--- third_party/libwebrtc/modules/congestion_controller/goog_cc/delay_based_bwe_gn/moz.build
+++ third_party/libwebrtc/modules/congestion_controller/goog_cc/delay_based_bwe_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -49,97 +58,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -147,82 +66,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("delay_based_bwe_gn")
diff --git third_party/libwebrtc/modules/congestion_controller/goog_cc/estimators_gn/moz.build third_party/libwebrtc/modules/congestion_controller/goog_cc/estimators_gn/moz.build
index a1354b7a4a75..6e6168b3c090 100644
--- third_party/libwebrtc/modules/congestion_controller/goog_cc/estimators_gn/moz.build
+++ third_party/libwebrtc/modules/congestion_controller/goog_cc/estimators_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -53,97 +62,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -151,82 +70,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("estimators_gn")
diff --git third_party/libwebrtc/modules/congestion_controller/goog_cc/goog_cc_gn/moz.build third_party/libwebrtc/modules/congestion_controller/goog_cc/goog_cc_gn/moz.build
index 73df6a67f893..aa4f70c95d77 100644
--- third_party/libwebrtc/modules/congestion_controller/goog_cc/goog_cc_gn/moz.build
+++ third_party/libwebrtc/modules/congestion_controller/goog_cc/goog_cc_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("goog_cc_gn")
diff --git third_party/libwebrtc/modules/congestion_controller/goog_cc/link_capacity_estimator_gn/moz.build third_party/libwebrtc/modules/congestion_controller/goog_cc/link_capacity_estimator_gn/moz.build
index f73a6728ffcb..35bfcb877dd1 100644
--- third_party/libwebrtc/modules/congestion_controller/goog_cc/link_capacity_estimator_gn/moz.build
+++ third_party/libwebrtc/modules/congestion_controller/goog_cc/link_capacity_estimator_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("link_capacity_estimator_gn")
diff --git third_party/libwebrtc/modules/congestion_controller/goog_cc/loss_based_bwe_v2_gn/moz.build third_party/libwebrtc/modules/congestion_controller/goog_cc/loss_based_bwe_v2_gn/moz.build
index 695bed8c62d8..ec77b2a3f0e4 100644
--- third_party/libwebrtc/modules/congestion_controller/goog_cc/loss_based_bwe_v2_gn/moz.build
+++ third_party/libwebrtc/modules/congestion_controller/goog_cc/loss_based_bwe_v2_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("loss_based_bwe_v2_gn")
diff --git third_party/libwebrtc/modules/congestion_controller/goog_cc/probe_controller_gn/moz.build third_party/libwebrtc/modules/congestion_controller/goog_cc/probe_controller_gn/moz.build
index 2522294ffb1e..b0ae964c4b1a 100644
--- third_party/libwebrtc/modules/congestion_controller/goog_cc/probe_controller_gn/moz.build
+++ third_party/libwebrtc/modules/congestion_controller/goog_cc/probe_controller_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("probe_controller_gn")
diff --git third_party/libwebrtc/modules/congestion_controller/goog_cc/pushback_controller_gn/moz.build third_party/libwebrtc/modules/congestion_controller/goog_cc/pushback_controller_gn/moz.build
index 9197849cb9c2..f6d16cc1161a 100644
--- third_party/libwebrtc/modules/congestion_controller/goog_cc/pushback_controller_gn/moz.build
+++ third_party/libwebrtc/modules/congestion_controller/goog_cc/pushback_controller_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("pushback_controller_gn")
diff --git third_party/libwebrtc/modules/congestion_controller/goog_cc/send_side_bwe_gn/moz.build third_party/libwebrtc/modules/congestion_controller/goog_cc/send_side_bwe_gn/moz.build
index afa3f14fccc3..095e449b7081 100644
--- third_party/libwebrtc/modules/congestion_controller/goog_cc/send_side_bwe_gn/moz.build
+++ third_party/libwebrtc/modules/congestion_controller/goog_cc/send_side_bwe_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("send_side_bwe_gn")
diff --git third_party/libwebrtc/modules/congestion_controller/goog_cc_scream_network_controller/goog_cc_scream_network_controller_gn/moz.build third_party/libwebrtc/modules/congestion_controller/goog_cc_scream_network_controller/goog_cc_scream_network_controller_gn/moz.build
index bf0be02c15cb..dd486132f5e1 100644
--- third_party/libwebrtc/modules/congestion_controller/goog_cc_scream_network_controller/goog_cc_scream_network_controller_gn/moz.build
+++ third_party/libwebrtc/modules/congestion_controller/goog_cc_scream_network_controller/goog_cc_scream_network_controller_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("goog_cc_scream_network_controller_gn")
diff --git third_party/libwebrtc/modules/congestion_controller/rtp/congestion_controller_feedback_stats_gn/moz.build third_party/libwebrtc/modules/congestion_controller/rtp/congestion_controller_feedback_stats_gn/moz.build
index a8e48af98475..f3e866d811c8 100644
--- third_party/libwebrtc/modules/congestion_controller/rtp/congestion_controller_feedback_stats_gn/moz.build
+++ third_party/libwebrtc/modules/congestion_controller/rtp/congestion_controller_feedback_stats_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("congestion_controller_feedback_stats_gn")
diff --git third_party/libwebrtc/modules/congestion_controller/rtp/control_handler_gn/moz.build third_party/libwebrtc/modules/congestion_controller/rtp/control_handler_gn/moz.build
index fbaaba8fef60..449bd7deb7d5 100644
--- third_party/libwebrtc/modules/congestion_controller/rtp/control_handler_gn/moz.build
+++ third_party/libwebrtc/modules/congestion_controller/rtp/control_handler_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("control_handler_gn")
diff --git third_party/libwebrtc/modules/congestion_controller/rtp/transport_feedback_gn/moz.build third_party/libwebrtc/modules/congestion_controller/rtp/transport_feedback_gn/moz.build
index 738c2e75e141..3241d31a9b7d 100644
--- third_party/libwebrtc/modules/congestion_controller/rtp/transport_feedback_gn/moz.build
+++ third_party/libwebrtc/modules/congestion_controller/rtp/transport_feedback_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -49,97 +58,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -147,82 +66,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("transport_feedback_gn")
diff --git third_party/libwebrtc/modules/congestion_controller/scream/delay_based_congestion_control_gn/moz.build third_party/libwebrtc/modules/congestion_controller/scream/delay_based_congestion_control_gn/moz.build
index 0156d2379510..0d4ea454b736 100644
--- third_party/libwebrtc/modules/congestion_controller/scream/delay_based_congestion_control_gn/moz.build
+++ third_party/libwebrtc/modules/congestion_controller/scream/delay_based_congestion_control_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("delay_based_congestion_control_gn")
diff --git third_party/libwebrtc/modules/congestion_controller/scream/loss_estimator_gn/moz.build third_party/libwebrtc/modules/congestion_controller/scream/loss_estimator_gn/moz.build
index 368c8b65edcb..8dd983ddb719 100644
--- third_party/libwebrtc/modules/congestion_controller/scream/loss_estimator_gn/moz.build
+++ third_party/libwebrtc/modules/congestion_controller/scream/loss_estimator_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("loss_estimator_gn")
diff --git third_party/libwebrtc/modules/congestion_controller/scream/scream_feedback_gn/moz.build third_party/libwebrtc/modules/congestion_controller/scream/scream_feedback_gn/moz.build
index 6cc47f52f745..f77348519576 100644
--- third_party/libwebrtc/modules/congestion_controller/scream/scream_feedback_gn/moz.build
+++ third_party/libwebrtc/modules/congestion_controller/scream/scream_feedback_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("scream_feedback_gn")
diff --git third_party/libwebrtc/modules/congestion_controller/scream/scream_network_controller_gn/moz.build third_party/libwebrtc/modules/congestion_controller/scream/scream_network_controller_gn/moz.build
index 25299e29ab84..f24e5f221b00 100644
--- third_party/libwebrtc/modules/congestion_controller/scream/scream_network_controller_gn/moz.build
+++ third_party/libwebrtc/modules/congestion_controller/scream/scream_network_controller_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("scream_network_controller_gn")
diff --git third_party/libwebrtc/modules/congestion_controller/scream/scream_v2_gn/moz.build third_party/libwebrtc/modules/congestion_controller/scream/scream_v2_gn/moz.build
index 438e435653b8..ec4240209f6c 100644
--- third_party/libwebrtc/modules/congestion_controller/scream/scream_v2_gn/moz.build
+++ third_party/libwebrtc/modules/congestion_controller/scream/scream_v2_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("scream_v2_gn")
diff --git third_party/libwebrtc/modules/congestion_controller/scream/scream_v2_parameters_gn/moz.build third_party/libwebrtc/modules/congestion_controller/scream/scream_v2_parameters_gn/moz.build
index 0b51999dc39f..879b14565851 100644
--- third_party/libwebrtc/modules/congestion_controller/scream/scream_v2_parameters_gn/moz.build
+++ third_party/libwebrtc/modules/congestion_controller/scream/scream_v2_parameters_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("scream_v2_parameters_gn")
diff --git third_party/libwebrtc/modules/desktop_capture/desktop_capture_differ_sse2_gn/moz.build third_party/libwebrtc/modules/desktop_capture/desktop_capture_differ_sse2_gn/moz.build
index 2639b8f1cc44..1b4be9858ef6 100644
--- third_party/libwebrtc/modules/desktop_capture/desktop_capture_differ_sse2_gn/moz.build
+++ third_party/libwebrtc/modules/desktop_capture/desktop_capture_differ_sse2_gn/moz.build
@@ -13,6 +13,9 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_AVX2"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
@@ -20,8 +23,14 @@ DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -49,102 +58,16 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
     DEFINES["_DEBUG"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
+if CONFIG["TARGET_CPU"] == "x86":
 
     CXXFLAGS += [
         "-msse2",
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
     CXXFLAGS += [
         "-msse2"
diff --git third_party/libwebrtc/modules/desktop_capture/desktop_capture_gn/moz.build third_party/libwebrtc/modules/desktop_capture/desktop_capture_gn/moz.build
index e42d0c59cff2..d550e4b64e04 100644
--- third_party/libwebrtc/modules/desktop_capture/desktop_capture_gn/moz.build
+++ third_party/libwebrtc/modules/desktop_capture/desktop_capture_gn/moz.build
@@ -26,14 +26,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -86,191 +95,14 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework AppKit",
-        "-framework AVFoundation",
-        "-framework CoreMedia",
-        "-framework CoreVideo",
-        "-framework Foundation",
-        "-framework IOKit",
-        "-framework IOSurface"
-    ]
-
-    UNIFIED_SOURCES += [
-        "/third_party/libwebrtc/modules/desktop_capture/mac/desktop_configuration_monitor.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/mac/desktop_frame_utils.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/mac/full_screen_mac_application_handler.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/mac/window_list_utils.cc"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    SOURCES += [
-        "/third_party/libwebrtc/modules/desktop_capture/mouse_cursor_monitor_linux.cc"
-    ]
-
-    UNIFIED_SOURCES += [
-        "/third_party/libwebrtc/modules/desktop_capture/screen_capturer_linux.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/window_capturer_linux.cc"
-    ]
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["WEBRTC_USE_X11"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "X11",
-        "Xcomposite",
-        "Xdamage",
-        "Xext",
-        "Xfixes",
-        "Xrandr",
-        "Xrender"
-    ]
-
-    SOURCES += [
-        "/third_party/libwebrtc/modules/desktop_capture/mouse_cursor_monitor_linux.cc"
-    ]
-
-    UNIFIED_SOURCES += [
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/mouse_cursor_monitor_x11.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/screen_capturer_x11.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/shared_x_display.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/window_capturer_x11.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/window_finder_x11.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/window_list_utils.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/x_atom_cache.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/x_server_pixel_buffer.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/x_window_property.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/screen_capturer_linux.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/window_capturer_linux.cc"
-    ]
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "d3d11",
-        "dwmapi",
-        "dxgi",
-        "iphlpapi",
-        "secur32",
-        "shcore",
-        "winmm"
-    ]
-
-    SOURCES += [
-        "/third_party/libwebrtc/modules/desktop_capture/win/screen_capturer_win_gdi.cc"
-    ]
-
-    UNIFIED_SOURCES += [
-        "/third_party/libwebrtc/modules/desktop_capture/cropping_window_capturer_win.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/desktop_frame_win.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/mouse_cursor_monitor_win.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/screen_capturer_win.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/win/cursor.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/win/d3d_device.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/win/desktop.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/win/desktop_capture_utils.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/win/display_configuration_monitor.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/win/dxgi_adapter_duplicator.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/win/dxgi_context.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/win/dxgi_desktop_frame.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/win/dxgi_duplicator_controller.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/win/dxgi_frame.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/win/dxgi_output_duplicator.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/win/dxgi_texture.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/win/dxgi_texture_mapping.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/win/dxgi_texture_staging.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/win/full_screen_win_application_handler.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/win/scoped_thread_desktop.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/win/screen_capture_utils.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/win/screen_capturer_win_directx.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/win/screen_capturer_win_magnifier.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/win/selected_window_context.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/win/wgc_capture_session.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/win/wgc_capture_source.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/win/wgc_capturer_win.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/win/wgc_desktop_frame.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/win/window_capture_utils.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/win/window_capturer_win_gdi.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/window_capturer_win.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/window_finder_win.cc"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
     DEFINES["WEBRTC_ARCH_ARM64"] = True
     DEFINES["WEBRTC_HAS_NEON"] = True
-    DEFINES["__ARM_NEON__"] = "1"
-
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["WEBRTC_USE_PIPEWIRE"] = True
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["__ARM_NEON__"] = "1"
 
     LOCAL_INCLUDES += [
         "/third_party/libepoxy/libepoxy/include/",
@@ -278,7 +110,8 @@ if CONFIG["TARGET_CPU"] == "arm":
     ]
 
     SOURCES += [
-        "/third_party/libwebrtc/modules/desktop_capture/linux/wayland/base_capturer_pipewire.cc"
+        "/third_party/libwebrtc/modules/desktop_capture/linux/wayland/base_capturer_pipewire.cc",
+        "/third_party/libwebrtc/modules/desktop_capture/mouse_cursor_monitor_linux.cc"
     ]
 
     UNIFIED_SOURCES += [
@@ -288,34 +121,9 @@ if CONFIG["TARGET_CPU"] == "arm":
         "/third_party/libwebrtc/modules/desktop_capture/linux/wayland/screen_capture_portal_interface.cc",
         "/third_party/libwebrtc/modules/desktop_capture/linux/wayland/screencast_portal.cc",
         "/third_party/libwebrtc/modules/desktop_capture/linux/wayland/screencast_stream_utils.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/wayland/shared_screencast_stream.cc"
-    ]
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["WEBRTC_USE_X11"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-    OS_LIBS += [
-        "X11",
-        "Xcomposite",
-        "Xdamage",
-        "Xext",
-        "Xfixes",
-        "Xrandr",
-        "Xrender"
-    ]
-
-    UNIFIED_SOURCES += [
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/mouse_cursor_monitor_x11.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/screen_capturer_x11.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/shared_x_display.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/window_capturer_x11.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/window_finder_x11.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/window_list_utils.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/x_atom_cache.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/x_server_pixel_buffer.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/x_window_property.cc"
+        "/third_party/libwebrtc/modules/desktop_capture/linux/wayland/shared_screencast_stream.cc",
+        "/third_party/libwebrtc/modules/desktop_capture/screen_capturer_linux.cc",
+        "/third_party/libwebrtc/modules/desktop_capture/window_capturer_linux.cc"
     ]
 
 if CONFIG["TARGET_CPU"] == "mips32":
@@ -323,7 +131,6 @@ if CONFIG["TARGET_CPU"] == "mips32":
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
     DEFINES["WEBRTC_USE_PIPEWIRE"] = True
-    DEFINES["_GNU_SOURCE"] = True
 
     LOCAL_INCLUDES += [
         "/third_party/libepoxy/libepoxy/include/",
@@ -331,7 +138,8 @@ if CONFIG["TARGET_CPU"] == "mips32":
     ]
 
     SOURCES += [
-        "/third_party/libwebrtc/modules/desktop_capture/linux/wayland/base_capturer_pipewire.cc"
+        "/third_party/libwebrtc/modules/desktop_capture/linux/wayland/base_capturer_pipewire.cc",
+        "/third_party/libwebrtc/modules/desktop_capture/mouse_cursor_monitor_linux.cc"
     ]
 
     UNIFIED_SOURCES += [
@@ -341,13 +149,14 @@ if CONFIG["TARGET_CPU"] == "mips32":
         "/third_party/libwebrtc/modules/desktop_capture/linux/wayland/screen_capture_portal_interface.cc",
         "/third_party/libwebrtc/modules/desktop_capture/linux/wayland/screencast_portal.cc",
         "/third_party/libwebrtc/modules/desktop_capture/linux/wayland/screencast_stream_utils.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/wayland/shared_screencast_stream.cc"
+        "/third_party/libwebrtc/modules/desktop_capture/linux/wayland/shared_screencast_stream.cc",
+        "/third_party/libwebrtc/modules/desktop_capture/screen_capturer_linux.cc",
+        "/third_party/libwebrtc/modules/desktop_capture/window_capturer_linux.cc"
     ]
 
 if CONFIG["TARGET_CPU"] == "mips64":
 
     DEFINES["WEBRTC_USE_PIPEWIRE"] = True
-    DEFINES["_GNU_SOURCE"] = True
 
     LOCAL_INCLUDES += [
         "/third_party/libepoxy/libepoxy/include/",
@@ -355,7 +164,8 @@ if CONFIG["TARGET_CPU"] == "mips64":
     ]
 
     SOURCES += [
-        "/third_party/libwebrtc/modules/desktop_capture/linux/wayland/base_capturer_pipewire.cc"
+        "/third_party/libwebrtc/modules/desktop_capture/linux/wayland/base_capturer_pipewire.cc",
+        "/third_party/libwebrtc/modules/desktop_capture/mouse_cursor_monitor_linux.cc"
     ]
 
     UNIFIED_SOURCES += [
@@ -365,117 +175,19 @@ if CONFIG["TARGET_CPU"] == "mips64":
         "/third_party/libwebrtc/modules/desktop_capture/linux/wayland/screen_capture_portal_interface.cc",
         "/third_party/libwebrtc/modules/desktop_capture/linux/wayland/screencast_portal.cc",
         "/third_party/libwebrtc/modules/desktop_capture/linux/wayland/screencast_stream_utils.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/wayland/shared_screencast_stream.cc"
-    ]
-
-if CONFIG["TARGET_CPU"] == "ppc64":
-
-    DEFINES["WEBRTC_USE_X11"] = True
-
-    OS_LIBS += [
-        "X11",
-        "Xcomposite",
-        "Xdamage",
-        "Xext",
-        "Xfixes",
-        "Xrandr",
-        "Xrender"
-    ]
-
-    UNIFIED_SOURCES += [
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/mouse_cursor_monitor_x11.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/screen_capturer_x11.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/shared_x_display.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/window_capturer_x11.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/window_finder_x11.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/window_list_utils.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/x_atom_cache.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/x_server_pixel_buffer.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/x_window_property.cc"
+        "/third_party/libwebrtc/modules/desktop_capture/linux/wayland/shared_screencast_stream.cc",
+        "/third_party/libwebrtc/modules/desktop_capture/screen_capturer_linux.cc",
+        "/third_party/libwebrtc/modules/desktop_capture/window_capturer_linux.cc"
     ]
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["WEBRTC_USE_PIPEWIRE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-    LOCAL_INCLUDES += [
-        "/third_party/libepoxy/libepoxy/include/",
-        "/third_party/libwebrtc/third_party/libepoxy/libepoxy/include/"
-    ]
-
-    SOURCES += [
-        "/third_party/libwebrtc/modules/desktop_capture/linux/wayland/base_capturer_pipewire.cc"
-    ]
-
-    UNIFIED_SOURCES += [
-        "/third_party/libwebrtc/modules/desktop_capture/linux/wayland/egl_dmabuf.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/wayland/mouse_cursor_monitor_pipewire.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/wayland/restore_token_manager.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/wayland/screen_capture_portal_interface.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/wayland/screencast_portal.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/wayland/screencast_stream_utils.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/wayland/shared_screencast_stream.cc"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "riscv64":
-
-    DEFINES["WEBRTC_USE_X11"] = True
-
-    OS_LIBS += [
-        "X11",
-        "Xcomposite",
-        "Xdamage",
-        "Xext",
-        "Xfixes",
-        "Xrandr",
-        "Xrender"
-    ]
-
-    UNIFIED_SOURCES += [
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/mouse_cursor_monitor_x11.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/screen_capturer_x11.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/shared_x_display.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/window_capturer_x11.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/window_finder_x11.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/window_list_utils.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/x_atom_cache.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/x_server_pixel_buffer.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/x_window_property.cc"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
     DEFINES["WEBRTC_USE_PIPEWIRE"] = True
-    DEFINES["_GNU_SOURCE"] = True
 
     LOCAL_INCLUDES += [
         "/third_party/libepoxy/libepoxy/include/",
@@ -483,7 +195,8 @@ if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
     ]
 
     SOURCES += [
-        "/third_party/libwebrtc/modules/desktop_capture/linux/wayland/base_capturer_pipewire.cc"
+        "/third_party/libwebrtc/modules/desktop_capture/linux/wayland/base_capturer_pipewire.cc",
+        "/third_party/libwebrtc/modules/desktop_capture/mouse_cursor_monitor_linux.cc"
     ]
 
     UNIFIED_SOURCES += [
@@ -493,13 +206,15 @@ if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
         "/third_party/libwebrtc/modules/desktop_capture/linux/wayland/screen_capture_portal_interface.cc",
         "/third_party/libwebrtc/modules/desktop_capture/linux/wayland/screencast_portal.cc",
         "/third_party/libwebrtc/modules/desktop_capture/linux/wayland/screencast_stream_utils.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/wayland/shared_screencast_stream.cc"
+        "/third_party/libwebrtc/modules/desktop_capture/linux/wayland/shared_screencast_stream.cc",
+        "/third_party/libwebrtc/modules/desktop_capture/screen_capturer_linux.cc",
+        "/third_party/libwebrtc/modules/desktop_capture/window_capturer_linux.cc"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
     DEFINES["WEBRTC_USE_PIPEWIRE"] = True
-    DEFINES["_GNU_SOURCE"] = True
 
     LOCAL_INCLUDES += [
         "/third_party/libepoxy/libepoxy/include/",
@@ -507,7 +222,8 @@ if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
     ]
 
     SOURCES += [
-        "/third_party/libwebrtc/modules/desktop_capture/linux/wayland/base_capturer_pipewire.cc"
+        "/third_party/libwebrtc/modules/desktop_capture/linux/wayland/base_capturer_pipewire.cc",
+        "/third_party/libwebrtc/modules/desktop_capture/mouse_cursor_monitor_linux.cc"
     ]
 
     UNIFIED_SOURCES += [
@@ -517,10 +233,12 @@ if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
         "/third_party/libwebrtc/modules/desktop_capture/linux/wayland/screen_capture_portal_interface.cc",
         "/third_party/libwebrtc/modules/desktop_capture/linux/wayland/screencast_portal.cc",
         "/third_party/libwebrtc/modules/desktop_capture/linux/wayland/screencast_stream_utils.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/wayland/shared_screencast_stream.cc"
+        "/third_party/libwebrtc/modules/desktop_capture/linux/wayland/shared_screencast_stream.cc",
+        "/third_party/libwebrtc/modules/desktop_capture/screen_capturer_linux.cc",
+        "/third_party/libwebrtc/modules/desktop_capture/window_capturer_linux.cc"
     ]
 
-if CONFIG["MOZ_X11"] == "1" and CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
+if CONFIG["MOZ_X11"] == "1" and CONFIG["OS_TARGET"] == "FreeBSD":
 
     DEFINES["WEBRTC_USE_X11"] = True
 
@@ -546,134 +264,61 @@ if CONFIG["MOZ_X11"] == "1" and CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGE
         "/third_party/libwebrtc/modules/desktop_capture/linux/x11/x_window_property.cc"
     ]
 
-if CONFIG["MOZ_X11"] == "1" and CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_USE_X11"] = True
-
-    OS_LIBS += [
-        "X11",
-        "Xcomposite",
-        "Xdamage",
-        "Xext",
-        "Xfixes",
-        "Xrandr",
-        "Xrender"
-    ]
+if not CONFIG["MOZ_X11"] and CONFIG["OS_TARGET"] == "FreeBSD" and CONFIG["TARGET_CPU"] == "loongarch64":
 
     UNIFIED_SOURCES += [
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/mouse_cursor_monitor_x11.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/screen_capturer_x11.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/shared_x_display.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/window_capturer_x11.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/window_finder_x11.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/window_list_utils.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/x_atom_cache.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/x_server_pixel_buffer.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/x_window_property.cc"
+        "/third_party/libwebrtc/modules/desktop_capture/mouse_cursor_monitor_null.cc",
+        "/third_party/libwebrtc/modules/desktop_capture/screen_capturer_null.cc",
+        "/third_party/libwebrtc/modules/desktop_capture/window_capturer_null.cc"
     ]
 
-if CONFIG["MOZ_X11"] == "1" and CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "mips32":
+if CONFIG["MOZ_X11"] == "1" and CONFIG["OS_TARGET"] == "FreeBSD" and CONFIG["TARGET_CPU"] == "loongarch64":
 
-    DEFINES["WEBRTC_USE_X11"] = True
-
-    OS_LIBS += [
-        "X11",
-        "Xcomposite",
-        "Xdamage",
-        "Xext",
-        "Xfixes",
-        "Xrandr",
-        "Xrender"
+    SOURCES += [
+        "/third_party/libwebrtc/modules/desktop_capture/mouse_cursor_monitor_linux.cc"
     ]
 
     UNIFIED_SOURCES += [
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/mouse_cursor_monitor_x11.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/screen_capturer_x11.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/shared_x_display.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/window_capturer_x11.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/window_finder_x11.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/window_list_utils.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/x_atom_cache.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/x_server_pixel_buffer.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/x_window_property.cc"
+        "/third_party/libwebrtc/modules/desktop_capture/screen_capturer_linux.cc",
+        "/third_party/libwebrtc/modules/desktop_capture/window_capturer_linux.cc"
     ]
 
-if CONFIG["MOZ_X11"] == "1" and CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["WEBRTC_USE_X11"] = True
-
-    OS_LIBS += [
-        "X11",
-        "Xcomposite",
-        "Xdamage",
-        "Xext",
-        "Xfixes",
-        "Xrandr",
-        "Xrender"
-    ]
+if not CONFIG["MOZ_X11"] and CONFIG["OS_TARGET"] == "FreeBSD" and CONFIG["TARGET_CPU"] == "ppc64":
 
     UNIFIED_SOURCES += [
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/mouse_cursor_monitor_x11.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/screen_capturer_x11.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/shared_x_display.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/window_capturer_x11.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/window_finder_x11.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/window_list_utils.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/x_atom_cache.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/x_server_pixel_buffer.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/x_window_property.cc"
+        "/third_party/libwebrtc/modules/desktop_capture/mouse_cursor_monitor_null.cc",
+        "/third_party/libwebrtc/modules/desktop_capture/screen_capturer_null.cc",
+        "/third_party/libwebrtc/modules/desktop_capture/window_capturer_null.cc"
     ]
 
-if CONFIG["MOZ_X11"] == "1" and CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
+if CONFIG["MOZ_X11"] == "1" and CONFIG["OS_TARGET"] == "FreeBSD" and CONFIG["TARGET_CPU"] == "ppc64":
 
-    DEFINES["WEBRTC_USE_X11"] = True
-
-    OS_LIBS += [
-        "X11",
-        "Xcomposite",
-        "Xdamage",
-        "Xext",
-        "Xfixes",
-        "Xrandr",
-        "Xrender"
+    SOURCES += [
+        "/third_party/libwebrtc/modules/desktop_capture/mouse_cursor_monitor_linux.cc"
     ]
 
     UNIFIED_SOURCES += [
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/mouse_cursor_monitor_x11.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/screen_capturer_x11.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/shared_x_display.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/window_capturer_x11.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/window_finder_x11.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/window_list_utils.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/x_atom_cache.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/x_server_pixel_buffer.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/x_window_property.cc"
+        "/third_party/libwebrtc/modules/desktop_capture/screen_capturer_linux.cc",
+        "/third_party/libwebrtc/modules/desktop_capture/window_capturer_linux.cc"
     ]
 
-if CONFIG["MOZ_X11"] == "1" and CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if not CONFIG["MOZ_X11"] and CONFIG["OS_TARGET"] == "FreeBSD" and CONFIG["TARGET_CPU"] == "riscv64":
 
-    DEFINES["WEBRTC_USE_X11"] = True
+    UNIFIED_SOURCES += [
+        "/third_party/libwebrtc/modules/desktop_capture/mouse_cursor_monitor_null.cc",
+        "/third_party/libwebrtc/modules/desktop_capture/screen_capturer_null.cc",
+        "/third_party/libwebrtc/modules/desktop_capture/window_capturer_null.cc"
+    ]
 
-    OS_LIBS += [
-        "X11",
-        "Xcomposite",
-        "Xdamage",
-        "Xext",
-        "Xfixes",
-        "Xrandr",
-        "Xrender"
+if CONFIG["MOZ_X11"] == "1" and CONFIG["OS_TARGET"] == "FreeBSD" and CONFIG["TARGET_CPU"] == "riscv64":
+
+    SOURCES += [
+        "/third_party/libwebrtc/modules/desktop_capture/mouse_cursor_monitor_linux.cc"
     ]
 
     UNIFIED_SOURCES += [
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/mouse_cursor_monitor_x11.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/screen_capturer_x11.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/shared_x_display.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/window_capturer_x11.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/window_finder_x11.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/window_list_utils.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/x_atom_cache.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/x_server_pixel_buffer.cc",
-        "/third_party/libwebrtc/modules/desktop_capture/linux/x11/x_window_property.cc"
+        "/third_party/libwebrtc/modules/desktop_capture/screen_capturer_linux.cc",
+        "/third_party/libwebrtc/modules/desktop_capture/window_capturer_linux.cc"
     ]
 
 Library("desktop_capture_gn")
diff --git third_party/libwebrtc/modules/desktop_capture/desktop_capture_objc_gn/moz.build third_party/libwebrtc/modules/desktop_capture/desktop_capture_objc_gn/moz.build
deleted file mode 100644
index 64136253925b..000000000000
--- third_party/libwebrtc/modules/desktop_capture/desktop_capture_objc_gn/moz.build
+++ /dev/null
@@ -1,93 +0,0 @@
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-
-  ### This moz.build was AUTOMATICALLY GENERATED from a GN config,  ###
-  ### DO NOT edit it by hand.                                       ###
-
-CMMFLAGS += [
-    "-fobjc-arc"
-]
-
-COMPILE_FLAGS["OS_INCLUDES"] = []
-AllowCompilerWarnings()
-
-DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
-DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
-DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
-DEFINES["RTC_ENABLE_VP9"] = True
-DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
-DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
-DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
-DEFINES["WEBRTC_LIBRARY_IMPL"] = True
-DEFINES["WEBRTC_MAC"] = True
-DEFINES["WEBRTC_MOZILLA_BUILD"] = True
-DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
-DEFINES["WEBRTC_POSIX"] = True
-DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
-DEFINES["WEBRTC_WITHOUT_RUST"] = True
-DEFINES["__STDC_CONSTANT_MACROS"] = True
-DEFINES["__STDC_FORMAT_MACROS"] = True
-
-FINAL_LIBRARY = "xul"
-
-
-LOCAL_INCLUDES += [
-    "!/dist/include/libwebrtc_overrides",
-    "!/ipc/ipdl/_ipdlheaders",
-    "!/third_party/libwebrtc/gen",
-    "/ipc/chromium/src",
-    "/third_party/abseil-cpp/",
-    "/third_party/libwebrtc/",
-    "/third_party/libwebrtc/sdk/objc/",
-    "/third_party/libwebrtc/sdk/objc/base/",
-    "/tools/profiler/public"
-]
-
-OS_LIBS += [
-    "-framework AppKit",
-    "-framework AVFoundation",
-    "-framework CoreMedia",
-    "-framework CoreVideo",
-    "-framework Foundation",
-    "-framework IOKit",
-    "-framework IOSurface"
-]
-
-UNIFIED_SOURCES += [
-    "/third_party/libwebrtc/modules/desktop_capture/mac/desktop_configuration.mm",
-    "/third_party/libwebrtc/modules/desktop_capture/mac/desktop_frame_cgimage.mm",
-    "/third_party/libwebrtc/modules/desktop_capture/mac/desktop_frame_iosurface.mm",
-    "/third_party/libwebrtc/modules/desktop_capture/mac/desktop_frame_provider.mm",
-    "/third_party/libwebrtc/modules/desktop_capture/mac/sck_picker_handle.mm",
-    "/third_party/libwebrtc/modules/desktop_capture/mac/screen_capturer_mac.mm",
-    "/third_party/libwebrtc/modules/desktop_capture/mac/screen_capturer_sck.mm",
-    "/third_party/libwebrtc/modules/desktop_capture/mouse_cursor_monitor_mac.mm",
-    "/third_party/libwebrtc/modules/desktop_capture/screen_capturer_darwin.mm",
-    "/third_party/libwebrtc/modules/desktop_capture/window_capturer_mac.mm",
-    "/third_party/libwebrtc/modules/desktop_capture/window_finder_mac.mm"
-]
-
-if not CONFIG["MOZ_DEBUG"]:
-
-    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "0"
-    DEFINES["NDEBUG"] = True
-    DEFINES["NVALGRIND"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1":
-
-    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["WEBRTC_ARCH_ARM64"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-    DEFINES["__ARM_NEON__"] = "1"
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-Library("desktop_capture_objc_gn")
diff --git third_party/libwebrtc/modules/desktop_capture/primitives_gn/moz.build third_party/libwebrtc/modules/desktop_capture/primitives_gn/moz.build
index 0483c8e2f1dc..0e67f02314f6 100644
--- third_party/libwebrtc/modules/desktop_capture/primitives_gn/moz.build
+++ third_party/libwebrtc/modules/desktop_capture/primitives_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -55,75 +64,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,69 +72,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("primitives_gn")
diff --git third_party/libwebrtc/modules/module_api_gn/moz.build third_party/libwebrtc/modules/module_api_gn/moz.build
index 3b2f42421002..d379dd893070 100644
--- third_party/libwebrtc/modules/module_api_gn/moz.build
+++ third_party/libwebrtc/modules/module_api_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("module_api_gn")
diff --git third_party/libwebrtc/modules/module_api_public_gn/moz.build third_party/libwebrtc/modules/module_api_public_gn/moz.build
index f5e7703f2a3c..a6a0375de3ec 100644
--- third_party/libwebrtc/modules/module_api_public_gn/moz.build
+++ third_party/libwebrtc/modules/module_api_public_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("module_api_public_gn")
diff --git third_party/libwebrtc/modules/module_fec_api_gn/moz.build third_party/libwebrtc/modules/module_fec_api_gn/moz.build
index ccf43e3b875f..83da8f49e3b3 100644
--- third_party/libwebrtc/modules/module_fec_api_gn/moz.build
+++ third_party/libwebrtc/modules/module_fec_api_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("module_fec_api_gn")
diff --git third_party/libwebrtc/modules/pacing/interval_budget_gn/moz.build third_party/libwebrtc/modules/pacing/interval_budget_gn/moz.build
index 871d14e1e609..13076d07dbf2 100644
--- third_party/libwebrtc/modules/pacing/interval_budget_gn/moz.build
+++ third_party/libwebrtc/modules/pacing/interval_budget_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("interval_budget_gn")
diff --git third_party/libwebrtc/modules/pacing/pacing_gn/moz.build third_party/libwebrtc/modules/pacing/pacing_gn/moz.build
index 89f56151cdbc..8d889385df00 100644
--- third_party/libwebrtc/modules/pacing/pacing_gn/moz.build
+++ third_party/libwebrtc/modules/pacing/pacing_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -55,97 +64,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -153,82 +72,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("pacing_gn")
diff --git third_party/libwebrtc/modules/portal/portal_gn/moz.build third_party/libwebrtc/modules/portal/portal_gn/moz.build
index 99d01cc07563..8754d0afbeb9 100644
--- third_party/libwebrtc/modules/portal/portal_gn/moz.build
+++ third_party/libwebrtc/modules/portal/portal_gn/moz.build
@@ -26,15 +26,13 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
-DEFINES["USE_AURA"] = "1"
 DEFINES["USE_GLIB"] = "1"
 DEFINES["USE_OZONE"] = "1"
-DEFINES["USE_UDEV"] = True
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
-DEFINES["WEBRTC_LINUX"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
 DEFINES["WEBRTC_POSIX"] = True
@@ -42,7 +40,6 @@ DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_USE_PIPEWIRE"] = True
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
 DEFINES["_FILE_OFFSET_BITS"] = "64"
-DEFINES["_GNU_SOURCE"] = True
 DEFINES["_LARGEFILE64_SOURCE"] = True
 DEFINES["_LARGEFILE_SOURCE"] = True
 DEFINES["__STDC_CONSTANT_MACROS"] = True
@@ -86,16 +83,6 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
diff --git third_party/libwebrtc/modules/remote_bitrate_estimator/congestion_control_feedback_generator_gn/moz.build third_party/libwebrtc/modules/remote_bitrate_estimator/congestion_control_feedback_generator_gn/moz.build
index 21554827e67f..8d3b6914e276 100644
--- third_party/libwebrtc/modules/remote_bitrate_estimator/congestion_control_feedback_generator_gn/moz.build
+++ third_party/libwebrtc/modules/remote_bitrate_estimator/congestion_control_feedback_generator_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -49,97 +58,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -147,82 +66,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("congestion_control_feedback_generator_gn")
diff --git third_party/libwebrtc/modules/remote_bitrate_estimator/remote_bitrate_estimator_gn/moz.build third_party/libwebrtc/modules/remote_bitrate_estimator/remote_bitrate_estimator_gn/moz.build
index 4c55f9002915..d3032050dd9c 100644
--- third_party/libwebrtc/modules/remote_bitrate_estimator/remote_bitrate_estimator_gn/moz.build
+++ third_party/libwebrtc/modules/remote_bitrate_estimator/remote_bitrate_estimator_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -57,97 +66,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -155,82 +74,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("remote_bitrate_estimator_gn")
diff --git third_party/libwebrtc/modules/remote_bitrate_estimator/rtp_transport_feedback_generator_gn/moz.build third_party/libwebrtc/modules/remote_bitrate_estimator/rtp_transport_feedback_generator_gn/moz.build
index 36cf61d4b0c9..bed91dbba868 100644
--- third_party/libwebrtc/modules/remote_bitrate_estimator/rtp_transport_feedback_generator_gn/moz.build
+++ third_party/libwebrtc/modules/remote_bitrate_estimator/rtp_transport_feedback_generator_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,97 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -170,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("rtp_transport_feedback_generator_gn")
diff --git third_party/libwebrtc/modules/remote_bitrate_estimator/transport_sequence_number_feedback_generator_gn/moz.build third_party/libwebrtc/modules/remote_bitrate_estimator/transport_sequence_number_feedback_generator_gn/moz.build
index 17b718dce3aa..171caeacf1cc 100644
--- third_party/libwebrtc/modules/remote_bitrate_estimator/transport_sequence_number_feedback_generator_gn/moz.build
+++ third_party/libwebrtc/modules/remote_bitrate_estimator/transport_sequence_number_feedback_generator_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -49,97 +58,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -147,82 +66,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("transport_sequence_number_feedback_generator_gn")
diff --git third_party/libwebrtc/modules/rtp_rtcp/leb128_gn/moz.build third_party/libwebrtc/modules/rtp_rtcp/leb128_gn/moz.build
index e1ff22274d1b..62de71a9fcb3 100644
--- third_party/libwebrtc/modules/rtp_rtcp/leb128_gn/moz.build
+++ third_party/libwebrtc/modules/rtp_rtcp/leb128_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,82 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("leb128_gn")
diff --git third_party/libwebrtc/modules/rtp_rtcp/ntp_time_util_gn/moz.build third_party/libwebrtc/modules/rtp_rtcp/ntp_time_util_gn/moz.build
index e211a7aad5a6..77c2c01324da 100644
--- third_party/libwebrtc/modules/rtp_rtcp/ntp_time_util_gn/moz.build
+++ third_party/libwebrtc/modules/rtp_rtcp/ntp_time_util_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("ntp_time_util_gn")
diff --git third_party/libwebrtc/modules/rtp_rtcp/rtp_rtcp_format_gn/moz.build third_party/libwebrtc/modules/rtp_rtcp/rtp_rtcp_format_gn/moz.build
index bd6404eda1c7..2987358f6bcf 100644
--- third_party/libwebrtc/modules/rtp_rtcp/rtp_rtcp_format_gn/moz.build
+++ third_party/libwebrtc/modules/rtp_rtcp/rtp_rtcp_format_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -92,97 +101,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -190,82 +109,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("rtp_rtcp_format_gn")
diff --git third_party/libwebrtc/modules/rtp_rtcp/rtp_rtcp_gn/moz.build third_party/libwebrtc/modules/rtp_rtcp/rtp_rtcp_gn/moz.build
index 8e8f12a879e2..b220f51534a8 100644
--- third_party/libwebrtc/modules/rtp_rtcp/rtp_rtcp_gn/moz.build
+++ third_party/libwebrtc/modules/rtp_rtcp/rtp_rtcp_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -102,97 +111,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -200,82 +119,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("rtp_rtcp_gn")
diff --git third_party/libwebrtc/modules/rtp_rtcp/rtp_video_header_gn/moz.build third_party/libwebrtc/modules/rtp_rtcp/rtp_video_header_gn/moz.build
index a3980bb1faaa..ab74beb3217e 100644
--- third_party/libwebrtc/modules/rtp_rtcp/rtp_video_header_gn/moz.build
+++ third_party/libwebrtc/modules/rtp_rtcp/rtp_video_header_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("rtp_video_header_gn")
diff --git third_party/libwebrtc/modules/rtp_rtcp/sframe_descriptor_gn/moz.build third_party/libwebrtc/modules/rtp_rtcp/sframe_descriptor_gn/moz.build
index ab10ec494116..65ad2d9aef91 100644
--- third_party/libwebrtc/modules/rtp_rtcp/sframe_descriptor_gn/moz.build
+++ third_party/libwebrtc/modules/rtp_rtcp/sframe_descriptor_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("sframe_descriptor_gn")
diff --git third_party/libwebrtc/modules/rtp_rtcp/sframe_rtp_packet_received_gn/moz.build third_party/libwebrtc/modules/rtp_rtcp/sframe_rtp_packet_received_gn/moz.build
index a0821532f64e..56eb7e3b1c9b 100644
--- third_party/libwebrtc/modules/rtp_rtcp/sframe_rtp_packet_received_gn/moz.build
+++ third_party/libwebrtc/modules/rtp_rtcp/sframe_rtp_packet_received_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,97 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -170,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("sframe_rtp_packet_received_gn")
diff --git third_party/libwebrtc/modules/third_party/fft/fft_gn/moz.build third_party/libwebrtc/modules/third_party/fft/fft_gn/moz.build
index 63899cb49dfd..486591a8a755 100644
--- third_party/libwebrtc/modules/third_party/fft/fft_gn/moz.build
+++ third_party/libwebrtc/modules/third_party/fft/fft_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,82 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
-    CFLAGS += [
-        "-msse2"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
     CFLAGS += [
         "-msse2"
     ]
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("fft_gn")
diff --git third_party/libwebrtc/modules/third_party/g711/g711_3p_gn/moz.build third_party/libwebrtc/modules/third_party/g711/g711_3p_gn/moz.build
index 10f720b486fd..f91b22752ad0 100644
--- third_party/libwebrtc/modules/third_party/g711/g711_3p_gn/moz.build
+++ third_party/libwebrtc/modules/third_party/g711/g711_3p_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,82 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
-    CFLAGS += [
-        "-msse2"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
     CFLAGS += [
         "-msse2"
     ]
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("g711_3p_gn")
diff --git third_party/libwebrtc/modules/third_party/g722/g722_3p_gn/moz.build third_party/libwebrtc/modules/third_party/g722/g722_3p_gn/moz.build
index 8433fd89edf4..59b4bfc4a7f7 100644
--- third_party/libwebrtc/modules/third_party/g722/g722_3p_gn/moz.build
+++ third_party/libwebrtc/modules/third_party/g722/g722_3p_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -52,82 +61,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +69,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
-    CFLAGS += [
-        "-msse2"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
     CFLAGS += [
         "-msse2"
     ]
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("g722_3p_gn")
diff --git third_party/libwebrtc/modules/utility/utility_gn/moz.build third_party/libwebrtc/modules/utility/utility_gn/moz.build
index 43f3436d01fd..0ed98276c196 100644
--- third_party/libwebrtc/modules/utility/utility_gn/moz.build
+++ third_party/libwebrtc/modules/utility/utility_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,90 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-    UNIFIED_SOURCES += [
-        "/third_party/libwebrtc/modules/utility/source/helpers_android.cc"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -163,52 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("utility_gn")
diff --git third_party/libwebrtc/modules/video_capture/video_capture_internal_impl_gn/moz.build third_party/libwebrtc/modules/video_capture/video_capture_internal_impl_gn/moz.build
index 3ae0e146d7e0..86f5959ed85b 100644
--- third_party/libwebrtc/modules/video_capture/video_capture_internal_impl_gn/moz.build
+++ third_party/libwebrtc/modules/video_capture/video_capture_internal_impl_gn/moz.build
@@ -18,14 +18,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -41,6 +50,10 @@ LOCAL_INCLUDES += [
 ]
 
 UNIFIED_SOURCES += [
+    "/third_party/libwebrtc/modules/video_capture/linux/device_info_linux.cc",
+    "/third_party/libwebrtc/modules/video_capture/linux/device_info_v4l2.cc",
+    "/third_party/libwebrtc/modules/video_capture/linux/video_capture_linux.cc",
+    "/third_party/libwebrtc/modules/video_capture/linux/video_capture_v4l2.cc",
     "/third_party/libwebrtc/modules/video_capture/video_capture_options.cc"
 ]
 
@@ -53,170 +66,14 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    UNIFIED_SOURCES += [
-        "/third_party/libwebrtc/modules/video_capture/linux/device_info_linux.cc",
-        "/third_party/libwebrtc/modules/video_capture/linux/device_info_v4l2.cc",
-        "/third_party/libwebrtc/modules/video_capture/linux/video_capture_linux.cc",
-        "/third_party/libwebrtc/modules/video_capture/linux/video_capture_v4l2.cc"
-    ]
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    UNIFIED_SOURCES += [
-        "/third_party/libwebrtc/modules/video_capture/linux/device_info_linux.cc",
-        "/third_party/libwebrtc/modules/video_capture/linux/device_info_v4l2.cc",
-        "/third_party/libwebrtc/modules/video_capture/linux/video_capture_linux.cc",
-        "/third_party/libwebrtc/modules/video_capture/linux/video_capture_v4l2.cc"
-    ]
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "ole32",
-        "oleaut32",
-        "secur32",
-        "strmiids",
-        "user32",
-        "winmm"
-    ]
-
-    SOURCES += [
-        "/third_party/libwebrtc/modules/video_capture/windows/device_info_ds.cc",
-        "/third_party/libwebrtc/modules/video_capture/windows/help_functions_ds.cc",
-        "/third_party/libwebrtc/modules/video_capture/windows/sink_filter_ds.cc"
-    ]
-
-    UNIFIED_SOURCES += [
-        "/third_party/libwebrtc/modules/video_capture/windows/video_capture_ds.cc",
-        "/third_party/libwebrtc/modules/video_capture/windows/video_capture_factory_windows.cc"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
     DEFINES["WEBRTC_ARCH_ARM64"] = True
     DEFINES["WEBRTC_HAS_NEON"] = True
-    DEFINES["__ARM_NEON__"] = "1"
-
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips32":
-
-    DEFINES["MIPS32_LE"] = True
-    DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["WEBRTC_USE_PIPEWIRE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-    LOCAL_INCLUDES += [
-        "/third_party/libepoxy/libepoxy/include/",
-        "/third_party/libwebrtc/third_party/libepoxy/libepoxy/include/"
-    ]
-
-    UNIFIED_SOURCES += [
-        "/third_party/libwebrtc/modules/video_capture/linux/camera_portal.cc",
-        "/third_party/libwebrtc/modules/video_capture/linux/device_info_pipewire.cc",
-        "/third_party/libwebrtc/modules/video_capture/linux/pipewire_session.cc",
-        "/third_party/libwebrtc/modules/video_capture/linux/video_capture_pipewire.cc"
-    ]
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
     DEFINES["WEBRTC_USE_PIPEWIRE"] = True
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["__ARM_NEON__"] = "1"
 
     LOCAL_INCLUDES += [
         "/third_party/libepoxy/libepoxy/include/",
@@ -230,44 +87,11 @@ if CONFIG["TARGET_CPU"] == "mips64":
         "/third_party/libwebrtc/modules/video_capture/linux/video_capture_pipewire.cc"
     ]
 
-if CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
+if CONFIG["TARGET_CPU"] == "mips32":
 
+    DEFINES["MIPS32_LE"] = True
+    DEFINES["MIPS_FPU_LE"] = True
     DEFINES["WEBRTC_USE_PIPEWIRE"] = True
-    DEFINES["_GNU_SOURCE"] = True
 
     LOCAL_INCLUDES += [
         "/third_party/libepoxy/libepoxy/include/",
@@ -281,10 +105,9 @@ if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
         "/third_party/libwebrtc/modules/video_capture/linux/video_capture_pipewire.cc"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
+if CONFIG["TARGET_CPU"] == "mips64":
 
     DEFINES["WEBRTC_USE_PIPEWIRE"] = True
-    DEFINES["_GNU_SOURCE"] = True
 
     LOCAL_INCLUDES += [
         "/third_party/libepoxy/libepoxy/include/",
@@ -298,14 +121,14 @@ if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
         "/third_party/libwebrtc/modules/video_capture/linux/video_capture_pipewire.cc"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
+if CONFIG["TARGET_CPU"] == "x86":
 
     CXXFLAGS += [
         "-msse2"
     ]
 
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
     DEFINES["WEBRTC_USE_PIPEWIRE"] = True
-    DEFINES["_GNU_SOURCE"] = True
 
     LOCAL_INCLUDES += [
         "/third_party/libepoxy/libepoxy/include/",
@@ -319,10 +142,10 @@ if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
         "/third_party/libwebrtc/modules/video_capture/linux/video_capture_pipewire.cc"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
     DEFINES["WEBRTC_USE_PIPEWIRE"] = True
-    DEFINES["_GNU_SOURCE"] = True
 
     LOCAL_INCLUDES += [
         "/third_party/libepoxy/libepoxy/include/",
diff --git third_party/libwebrtc/modules/video_capture/video_capture_module_gn/moz.build third_party/libwebrtc/modules/video_capture/video_capture_module_gn/moz.build
index 0f805d119613..660a584947a9 100644
--- third_party/libwebrtc/modules/video_capture/video_capture_module_gn/moz.build
+++ third_party/libwebrtc/modules/video_capture/video_capture_module_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -52,97 +61,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -150,82 +69,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("video_capture_module_gn")
diff --git third_party/libwebrtc/modules/video_coding/chain_diff_calculator_gn/moz.build third_party/libwebrtc/modules/video_coding/chain_diff_calculator_gn/moz.build
index bc7fcd53c8c6..7d8e7c526a0f 100644
--- third_party/libwebrtc/modules/video_coding/chain_diff_calculator_gn/moz.build
+++ third_party/libwebrtc/modules/video_coding/chain_diff_calculator_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("chain_diff_calculator_gn")
diff --git third_party/libwebrtc/modules/video_coding/codec_globals_headers_gn/moz.build third_party/libwebrtc/modules/video_coding/codec_globals_headers_gn/moz.build
index 59fe08e090aa..b470cf751d1f 100644
--- third_party/libwebrtc/modules/video_coding/codec_globals_headers_gn/moz.build
+++ third_party/libwebrtc/modules/video_coding/codec_globals_headers_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,86 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -159,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("codec_globals_headers_gn")
diff --git third_party/libwebrtc/modules/video_coding/codecs/av1/av1_svc_config_gn/moz.build third_party/libwebrtc/modules/video_coding/codecs/av1/av1_svc_config_gn/moz.build
index 9b7e305e83d1..c38a4a6b8395 100644
--- third_party/libwebrtc/modules/video_coding/codecs/av1/av1_svc_config_gn/moz.build
+++ third_party/libwebrtc/modules/video_coding/codecs/av1/av1_svc_config_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("av1_svc_config_gn")
diff --git third_party/libwebrtc/modules/video_coding/codecs/av1/dav1d_decoder_gn/moz.build third_party/libwebrtc/modules/video_coding/codecs/av1/dav1d_decoder_gn/moz.build
index 4dec968aad57..8a9153baf78e 100644
--- third_party/libwebrtc/modules/video_coding/codecs/av1/dav1d_decoder_gn/moz.build
+++ third_party/libwebrtc/modules/video_coding/codecs/av1/dav1d_decoder_gn/moz.build
@@ -16,14 +16,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -55,97 +64,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -153,82 +72,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("dav1d_decoder_gn")
diff --git third_party/libwebrtc/modules/video_coding/codecs/av1/libaom_av1_encoder_gn/moz.build third_party/libwebrtc/modules/video_coding/codecs/av1/libaom_av1_encoder_gn/moz.build
index b8aaa34e6c8e..c5005718ea32 100644
--- third_party/libwebrtc/modules/video_coding/codecs/av1/libaom_av1_encoder_gn/moz.build
+++ third_party/libwebrtc/modules/video_coding/codecs/av1/libaom_av1_encoder_gn/moz.build
@@ -16,14 +16,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -51,97 +60,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -149,82 +68,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("aom_av1_encoder_gn")
diff --git third_party/libwebrtc/modules/video_coding/codecs/av1/libaom_speed_config_factory_gn/moz.build third_party/libwebrtc/modules/video_coding/codecs/av1/libaom_speed_config_factory_gn/moz.build
index c549066a23d0..c2a7d606db62 100644
--- third_party/libwebrtc/modules/video_coding/codecs/av1/libaom_speed_config_factory_gn/moz.build
+++ third_party/libwebrtc/modules/video_coding/codecs/av1/libaom_speed_config_factory_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("aom_speed_config_factory_gn")
diff --git third_party/libwebrtc/modules/video_coding/encoded_frame_gn/moz.build third_party/libwebrtc/modules/video_coding/encoded_frame_gn/moz.build
index 4e40cff8c5f5..244654645789 100644
--- third_party/libwebrtc/modules/video_coding/encoded_frame_gn/moz.build
+++ third_party/libwebrtc/modules/video_coding/encoded_frame_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("encoded_frame_gn")
diff --git third_party/libwebrtc/modules/video_coding/encoder_speed_controller_impl_gn/moz.build third_party/libwebrtc/modules/video_coding/encoder_speed_controller_impl_gn/moz.build
index 3cb46a4d7a8f..93ea0ec033e4 100644
--- third_party/libwebrtc/modules/video_coding/encoder_speed_controller_impl_gn/moz.build
+++ third_party/libwebrtc/modules/video_coding/encoder_speed_controller_impl_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("encoder_speed_controller_impl_gn")
diff --git third_party/libwebrtc/modules/video_coding/frame_dependencies_calculator_gn/moz.build third_party/libwebrtc/modules/video_coding/frame_dependencies_calculator_gn/moz.build
index 46323da318ba..a97df11ea532 100644
--- third_party/libwebrtc/modules/video_coding/frame_dependencies_calculator_gn/moz.build
+++ third_party/libwebrtc/modules/video_coding/frame_dependencies_calculator_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("frame_dependencies_calculator_gn")
diff --git third_party/libwebrtc/modules/video_coding/frame_helpers_gn/moz.build third_party/libwebrtc/modules/video_coding/frame_helpers_gn/moz.build
index a7897eb22f04..fab2d7f32e45 100644
--- third_party/libwebrtc/modules/video_coding/frame_helpers_gn/moz.build
+++ third_party/libwebrtc/modules/video_coding/frame_helpers_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("frame_helpers_gn")
diff --git third_party/libwebrtc/modules/video_coding/frame_sampler_gn/moz.build third_party/libwebrtc/modules/video_coding/frame_sampler_gn/moz.build
index 03b9c69b5a2a..62f2f0f6ab77 100644
--- third_party/libwebrtc/modules/video_coding/frame_sampler_gn/moz.build
+++ third_party/libwebrtc/modules/video_coding/frame_sampler_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("frame_sampler_gn")
diff --git third_party/libwebrtc/modules/video_coding/h264_sprop_parameter_sets_gn/moz.build third_party/libwebrtc/modules/video_coding/h264_sprop_parameter_sets_gn/moz.build
index c89fe5afdb04..7975dbc69892 100644
--- third_party/libwebrtc/modules/video_coding/h264_sprop_parameter_sets_gn/moz.build
+++ third_party/libwebrtc/modules/video_coding/h264_sprop_parameter_sets_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("h264_sprop_parameter_sets_gn")
diff --git third_party/libwebrtc/modules/video_coding/h26x_packet_buffer_gn/moz.build third_party/libwebrtc/modules/video_coding/h26x_packet_buffer_gn/moz.build
index 59022c96e2e0..fc98dc35f64d 100644
--- third_party/libwebrtc/modules/video_coding/h26x_packet_buffer_gn/moz.build
+++ third_party/libwebrtc/modules/video_coding/h26x_packet_buffer_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("h26x_packet_buffer_gn")
diff --git third_party/libwebrtc/modules/video_coding/nack_requester_gn/moz.build third_party/libwebrtc/modules/video_coding/nack_requester_gn/moz.build
index 317e0c782d5e..3471c6d211cd 100644
--- third_party/libwebrtc/modules/video_coding/nack_requester_gn/moz.build
+++ third_party/libwebrtc/modules/video_coding/nack_requester_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -49,97 +58,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -147,82 +66,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("nack_requester_gn")
diff --git third_party/libwebrtc/modules/video_coding/packet_buffer_gn/moz.build third_party/libwebrtc/modules/video_coding/packet_buffer_gn/moz.build
index 1ff8393e1f75..369a69e28184 100644
--- third_party/libwebrtc/modules/video_coding/packet_buffer_gn/moz.build
+++ third_party/libwebrtc/modules/video_coding/packet_buffer_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("packet_buffer_gn")
diff --git third_party/libwebrtc/modules/video_coding/svc/scalability_mode_util_gn/moz.build third_party/libwebrtc/modules/video_coding/svc/scalability_mode_util_gn/moz.build
index a20cabd4b4cc..5ea6824fb710 100644
--- third_party/libwebrtc/modules/video_coding/svc/scalability_mode_util_gn/moz.build
+++ third_party/libwebrtc/modules/video_coding/svc/scalability_mode_util_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("scalability_mode_util_gn")
diff --git third_party/libwebrtc/modules/video_coding/svc/scalability_structures_gn/moz.build third_party/libwebrtc/modules/video_coding/svc/scalability_structures_gn/moz.build
index 646f8eeb2984..7a46db91efe8 100644
--- third_party/libwebrtc/modules/video_coding/svc/scalability_structures_gn/moz.build
+++ third_party/libwebrtc/modules/video_coding/svc/scalability_structures_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -55,97 +64,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -153,82 +72,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("scalability_structures_gn")
diff --git third_party/libwebrtc/modules/video_coding/svc/scalable_video_controller_gn/moz.build third_party/libwebrtc/modules/video_coding/svc/scalable_video_controller_gn/moz.build
index 825c0ef6504b..70ab23b91bfc 100644
--- third_party/libwebrtc/modules/video_coding/svc/scalable_video_controller_gn/moz.build
+++ third_party/libwebrtc/modules/video_coding/svc/scalable_video_controller_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("scalable_video_controller_gn")
diff --git third_party/libwebrtc/modules/video_coding/svc/simulcast_to_svc_converter_gn/moz.build third_party/libwebrtc/modules/video_coding/svc/simulcast_to_svc_converter_gn/moz.build
index aa96b3697638..e4daf63e253a 100644
--- third_party/libwebrtc/modules/video_coding/svc/simulcast_to_svc_converter_gn/moz.build
+++ third_party/libwebrtc/modules/video_coding/svc/simulcast_to_svc_converter_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("simulcast_to_svc_converter_gn")
diff --git third_party/libwebrtc/modules/video_coding/svc/svc_rate_allocator_gn/moz.build third_party/libwebrtc/modules/video_coding/svc/svc_rate_allocator_gn/moz.build
index f6583bfc698e..50e9e6b88444 100644
--- third_party/libwebrtc/modules/video_coding/svc/svc_rate_allocator_gn/moz.build
+++ third_party/libwebrtc/modules/video_coding/svc/svc_rate_allocator_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("svc_rate_allocator_gn")
diff --git third_party/libwebrtc/modules/video_coding/timing/decode_time_percentile_filter_gn/moz.build third_party/libwebrtc/modules/video_coding/timing/decode_time_percentile_filter_gn/moz.build
index d9d718eb546a..df919f9aefc7 100644
--- third_party/libwebrtc/modules/video_coding/timing/decode_time_percentile_filter_gn/moz.build
+++ third_party/libwebrtc/modules/video_coding/timing/decode_time_percentile_filter_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("decode_time_percentile_filter_gn")
diff --git third_party/libwebrtc/modules/video_coding/timing/timing_module_gn/moz.build third_party/libwebrtc/modules/video_coding/timing/timing_module_gn/moz.build
index 61cb2bb4fbf5..015165de5f1c 100644
--- third_party/libwebrtc/modules/video_coding/timing/timing_module_gn/moz.build
+++ third_party/libwebrtc/modules/video_coding/timing/timing_module_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("timing_module_gn")
diff --git third_party/libwebrtc/modules/video_coding/video_codec_interface_gn/moz.build third_party/libwebrtc/modules/video_coding/video_codec_interface_gn/moz.build
index 7f0ee63a3d8b..930c98234686 100644
--- third_party/libwebrtc/modules/video_coding/video_codec_interface_gn/moz.build
+++ third_party/libwebrtc/modules/video_coding/video_codec_interface_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -50,97 +59,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -148,82 +67,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("video_codec_interface_gn")
diff --git third_party/libwebrtc/modules/video_coding/video_coding_gn/moz.build third_party/libwebrtc/modules/video_coding/video_coding_gn/moz.build
index bb04750a81cb..69def502705f 100644
--- third_party/libwebrtc/modules/video_coding/video_coding_gn/moz.build
+++ third_party/libwebrtc/modules/video_coding/video_coding_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -61,97 +70,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -159,82 +78,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("video_coding_gn")
diff --git third_party/libwebrtc/modules/video_coding/video_coding_utility_gn/moz.build third_party/libwebrtc/modules/video_coding/video_coding_utility_gn/moz.build
index 9739291d7af1..fc3a3187b6c1 100644
--- third_party/libwebrtc/modules/video_coding/video_coding_utility_gn/moz.build
+++ third_party/libwebrtc/modules/video_coding/video_coding_utility_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -60,97 +69,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -158,82 +77,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("video_coding_utility_gn")
diff --git third_party/libwebrtc/modules/video_coding/webrtc_h264_gn/moz.build third_party/libwebrtc/modules/video_coding/webrtc_h264_gn/moz.build
index 07619736fa60..9f96a6588f3a 100644
--- third_party/libwebrtc/modules/video_coding/webrtc_h264_gn/moz.build
+++ third_party/libwebrtc/modules/video_coding/webrtc_h264_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -53,97 +62,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -151,82 +70,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("webrtc_h264_gn")
diff --git third_party/libwebrtc/modules/video_coding/webrtc_libvpx_interface_gn/moz.build third_party/libwebrtc/modules/video_coding/webrtc_libvpx_interface_gn/moz.build
index 26004eb73c62..39e0664ce222 100644
--- third_party/libwebrtc/modules/video_coding/webrtc_libvpx_interface_gn/moz.build
+++ third_party/libwebrtc/modules/video_coding/webrtc_libvpx_interface_gn/moz.build
@@ -16,14 +16,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -51,86 +60,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -138,82 +68,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("webrtc_libvpx_interface_gn")
diff --git third_party/libwebrtc/modules/video_coding/webrtc_vp8_gn/moz.build third_party/libwebrtc/modules/video_coding/webrtc_vp8_gn/moz.build
index ce4a15b18a46..4a36cc5857f4 100644
--- third_party/libwebrtc/modules/video_coding/webrtc_vp8_gn/moz.build
+++ third_party/libwebrtc/modules/video_coding/webrtc_vp8_gn/moz.build
@@ -16,14 +16,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -54,97 +63,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -152,82 +71,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("webrtc_vp8_gn")
diff --git third_party/libwebrtc/modules/video_coding/webrtc_vp8_scalability_gn/moz.build third_party/libwebrtc/modules/video_coding/webrtc_vp8_scalability_gn/moz.build
index c7c27a4dd7b9..6b621709614d 100644
--- third_party/libwebrtc/modules/video_coding/webrtc_vp8_scalability_gn/moz.build
+++ third_party/libwebrtc/modules/video_coding/webrtc_vp8_scalability_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("webrtc_vp8_scalability_gn")
diff --git third_party/libwebrtc/modules/video_coding/webrtc_vp8_temporal_layers_gn/moz.build third_party/libwebrtc/modules/video_coding/webrtc_vp8_temporal_layers_gn/moz.build
index e5e925cb69e8..14e51f29152c 100644
--- third_party/libwebrtc/modules/video_coding/webrtc_vp8_temporal_layers_gn/moz.build
+++ third_party/libwebrtc/modules/video_coding/webrtc_vp8_temporal_layers_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -53,97 +62,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -151,82 +70,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("webrtc_vp8_temporal_layers_gn")
diff --git third_party/libwebrtc/modules/video_coding/webrtc_vp9_gn/moz.build third_party/libwebrtc/modules/video_coding/webrtc_vp9_gn/moz.build
index 62c1cef3a83a..5952be3d93d7 100644
--- third_party/libwebrtc/modules/video_coding/webrtc_vp9_gn/moz.build
+++ third_party/libwebrtc/modules/video_coding/webrtc_vp9_gn/moz.build
@@ -16,14 +16,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -56,97 +65,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -154,82 +73,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("webrtc_vp9_gn")
diff --git third_party/libwebrtc/modules/video_coding/webrtc_vp9_helpers_gn/moz.build third_party/libwebrtc/modules/video_coding/webrtc_vp9_helpers_gn/moz.build
index ed03a17fabfe..5af46ee4daee 100644
--- third_party/libwebrtc/modules/video_coding/webrtc_vp9_helpers_gn/moz.build
+++ third_party/libwebrtc/modules/video_coding/webrtc_vp9_helpers_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("webrtc_vp9_helpers_gn")
diff --git third_party/libwebrtc/moz.build third_party/libwebrtc/moz.build
index 3c76a6f9e6b2..01020f3fffbb 100644
--- third_party/libwebrtc/moz.build
+++ third_party/libwebrtc/moz.build
@@ -305,6 +305,8 @@ DIRS += [
     "/third_party/libwebrtc/modules/congestion_controller/scream/scream_network_controller_gn",
     "/third_party/libwebrtc/modules/congestion_controller/scream/scream_v2_gn",
     "/third_party/libwebrtc/modules/congestion_controller/scream/scream_v2_parameters_gn",
+    "/third_party/libwebrtc/modules/desktop_capture/desktop_capture_gn",
+    "/third_party/libwebrtc/modules/desktop_capture/primitives_gn",
     "/third_party/libwebrtc/modules/module_api_gn",
     "/third_party/libwebrtc/modules/module_api_public_gn",
     "/third_party/libwebrtc/modules/module_fec_api_gn",
@@ -539,143 +541,31 @@ DIRS += [
     "/third_party/libwebrtc/webrtc_gn"
 ]
 
-if CONFIG["OS_TARGET"] == "Android":
-
-    DIRS += [
-        "/third_party/libwebrtc/common_audio/fir_filter_gn",
-        "/third_party/libwebrtc/rtc_base/ifaddrs_android_gn",
-        "/third_party/libwebrtc/third_party/cpu_features/ndk_compat_gn"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DIRS += [
-        "/third_party/libwebrtc/common_audio/fir_filter_gn",
-        "/third_party/libwebrtc/modules/desktop_capture/desktop_capture_gn",
-        "/third_party/libwebrtc/modules/desktop_capture/desktop_capture_objc_gn",
-        "/third_party/libwebrtc/modules/desktop_capture/primitives_gn",
-        "/third_party/libwebrtc/rtc_base/system/cocoa_threading_gn",
-        "/third_party/libwebrtc/rtc_base/system/gcd_helpers_gn",
-        "/third_party/libwebrtc/sdk/base_objc_gn",
-        "/third_party/libwebrtc/sdk/helpers_objc_gn",
-        "/third_party/libwebrtc/sdk/videocapture_objc_gn",
-        "/third_party/libwebrtc/sdk/videoframebuffer_objc_gn"
-    ]
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DIRS += [
-        "/third_party/libwebrtc/modules/desktop_capture/desktop_capture_gn",
-        "/third_party/libwebrtc/modules/desktop_capture/primitives_gn"
-    ]
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DIRS += [
-        "/third_party/libwebrtc/common_audio/fir_filter_gn",
-        "/third_party/libwebrtc/modules/desktop_capture/desktop_capture_gn",
-        "/third_party/libwebrtc/modules/desktop_capture/primitives_gn",
-        "/third_party/libwebrtc/rtc_base/win/create_direct3d_device_gn",
-        "/third_party/libwebrtc/rtc_base/win/get_activation_factory_gn",
-        "/third_party/libwebrtc/rtc_base/win/hstring_gn",
-        "/third_party/libwebrtc/rtc_base/win/windows_version_gn",
-        "/third_party/libwebrtc/rtc_base/win32_gn"
-    ]
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DIRS += [
-        "/third_party/libwebrtc/common_audio/common_audio_neon_c_gn",
-        "/third_party/libwebrtc/common_audio/common_audio_neon_gn"
-    ]
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "arm":
-
-    DIRS += [
-        "/third_party/libwebrtc/common_audio/common_audio_neon_c_gn",
-        "/third_party/libwebrtc/common_audio/common_audio_neon_gn",
-        "/third_party/libwebrtc/rtc_base/system/asm_defines_gn"
-    ]
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
-    DIRS += [
-        "/third_party/libwebrtc/common_audio/common_audio_avx2_gn",
-        "/third_party/libwebrtc/common_audio/common_audio_sse2_gn",
-        "/third_party/libwebrtc/modules/audio_processing/aec3/aec3_avx2_gn",
-        "/third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/vector_math_avx2_gn"
-    ]
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DIRS += [
-        "/third_party/libwebrtc/common_audio/common_audio_avx2_gn",
-        "/third_party/libwebrtc/common_audio/common_audio_sse2_gn",
-        "/third_party/libwebrtc/modules/audio_processing/aec3/aec3_avx2_gn",
-        "/third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/vector_math_avx2_gn"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DIRS += [
-        "/third_party/libwebrtc/common_audio/common_audio_neon_c_gn",
-        "/third_party/libwebrtc/common_audio/common_audio_neon_gn"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DIRS += [
-        "/third_party/libwebrtc/common_audio/common_audio_avx2_gn",
-        "/third_party/libwebrtc/common_audio/common_audio_sse2_gn",
-        "/third_party/libwebrtc/modules/audio_processing/aec3/aec3_avx2_gn",
-        "/third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/vector_math_avx2_gn",
-        "/third_party/libwebrtc/modules/desktop_capture/desktop_capture_differ_sse2_gn"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
+if CONFIG["OS_TARGET"] == "FreeBSD" and CONFIG["TARGET_CPU"] == "aarch64":
 
     DIRS += [
         "/third_party/libwebrtc/common_audio/common_audio_neon_c_gn",
         "/third_party/libwebrtc/common_audio/common_audio_neon_gn",
         "/third_party/libwebrtc/common_audio/fir_filter_gn",
-        "/third_party/libwebrtc/modules/desktop_capture/desktop_capture_gn",
-        "/third_party/libwebrtc/modules/desktop_capture/primitives_gn",
         "/third_party/libwebrtc/modules/portal/portal_gn",
         "/third_party/libwebrtc/third_party/libepoxy/libepoxy_gn"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
+if CONFIG["OS_TARGET"] == "FreeBSD" and CONFIG["TARGET_CPU"] == "mips32":
 
     DIRS += [
-        "/third_party/libwebrtc/common_audio/common_audio_neon_c_gn",
-        "/third_party/libwebrtc/common_audio/common_audio_neon_gn",
-        "/third_party/libwebrtc/common_audio/fir_filter_gn",
-        "/third_party/libwebrtc/modules/desktop_capture/desktop_capture_gn",
-        "/third_party/libwebrtc/modules/desktop_capture/primitives_gn",
         "/third_party/libwebrtc/modules/portal/portal_gn",
-        "/third_party/libwebrtc/rtc_base/system/asm_defines_gn",
         "/third_party/libwebrtc/third_party/libepoxy/libepoxy_gn"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "mips32":
+if CONFIG["OS_TARGET"] == "FreeBSD" and CONFIG["TARGET_CPU"] == "mips64":
 
     DIRS += [
-        "/third_party/libwebrtc/modules/desktop_capture/desktop_capture_gn",
-        "/third_party/libwebrtc/modules/desktop_capture/primitives_gn",
         "/third_party/libwebrtc/modules/portal/portal_gn",
         "/third_party/libwebrtc/third_party/libepoxy/libepoxy_gn"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "mips64":
-
-    DIRS += [
-        "/third_party/libwebrtc/modules/desktop_capture/desktop_capture_gn",
-        "/third_party/libwebrtc/modules/desktop_capture/primitives_gn",
-        "/third_party/libwebrtc/modules/portal/portal_gn",
-        "/third_party/libwebrtc/third_party/libepoxy/libepoxy_gn"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
+if CONFIG["OS_TARGET"] == "FreeBSD" and CONFIG["TARGET_CPU"] == "x86":
 
     DIRS += [
         "/third_party/libwebrtc/common_audio/common_audio_avx2_gn",
@@ -684,13 +574,11 @@ if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
         "/third_party/libwebrtc/modules/audio_processing/aec3/aec3_avx2_gn",
         "/third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/vector_math_avx2_gn",
         "/third_party/libwebrtc/modules/desktop_capture/desktop_capture_differ_sse2_gn",
-        "/third_party/libwebrtc/modules/desktop_capture/desktop_capture_gn",
-        "/third_party/libwebrtc/modules/desktop_capture/primitives_gn",
         "/third_party/libwebrtc/modules/portal/portal_gn",
         "/third_party/libwebrtc/third_party/libepoxy/libepoxy_gn"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["OS_TARGET"] == "FreeBSD" and CONFIG["TARGET_CPU"] == "x86_64":
 
     DIRS += [
         "/third_party/libwebrtc/common_audio/common_audio_avx2_gn",
@@ -699,75 +587,6 @@ if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
         "/third_party/libwebrtc/modules/audio_processing/aec3/aec3_avx2_gn",
         "/third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/vector_math_avx2_gn",
         "/third_party/libwebrtc/modules/desktop_capture/desktop_capture_differ_sse2_gn",
-        "/third_party/libwebrtc/modules/desktop_capture/desktop_capture_gn",
-        "/third_party/libwebrtc/modules/desktop_capture/primitives_gn",
         "/third_party/libwebrtc/modules/portal/portal_gn",
         "/third_party/libwebrtc/third_party/libepoxy/libepoxy_gn"
     ]
-
-if CONFIG["OS_TARGET"] == "OpenBSD" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DIRS += [
-        "/third_party/libwebrtc/common_audio/common_audio_neon_c_gn",
-        "/third_party/libwebrtc/common_audio/common_audio_neon_gn",
-        "/third_party/libwebrtc/common_audio/fir_filter_gn"
-    ]
-
-if CONFIG["OS_TARGET"] == "OpenBSD" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DIRS += [
-        "/third_party/libwebrtc/common_audio/common_audio_avx2_gn",
-        "/third_party/libwebrtc/common_audio/common_audio_sse2_gn",
-        "/third_party/libwebrtc/common_audio/fir_filter_gn",
-        "/third_party/libwebrtc/modules/audio_processing/aec3/aec3_avx2_gn",
-        "/third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/vector_math_avx2_gn",
-        "/third_party/libwebrtc/modules/desktop_capture/desktop_capture_differ_sse2_gn"
-    ]
-
-if CONFIG["OS_TARGET"] == "WINNT" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DIRS += [
-        "/third_party/libwebrtc/common_audio/common_audio_neon_c_gn",
-        "/third_party/libwebrtc/common_audio/common_audio_neon_gn"
-    ]
-
-if CONFIG["OS_TARGET"] == "WINNT" and CONFIG["TARGET_CPU"] == "x86":
-
-    DIRS += [
-        "/third_party/libwebrtc/common_audio/common_audio_avx2_gn",
-        "/third_party/libwebrtc/common_audio/common_audio_sse2_gn",
-        "/third_party/libwebrtc/modules/audio_processing/aec3/aec3_avx2_gn",
-        "/third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/vector_math_avx2_gn",
-        "/third_party/libwebrtc/modules/desktop_capture/desktop_capture_differ_sse2_gn"
-    ]
-
-if CONFIG["OS_TARGET"] == "WINNT" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DIRS += [
-        "/third_party/libwebrtc/common_audio/common_audio_avx2_gn",
-        "/third_party/libwebrtc/common_audio/common_audio_sse2_gn",
-        "/third_party/libwebrtc/modules/audio_processing/aec3/aec3_avx2_gn",
-        "/third_party/libwebrtc/modules/audio_processing/agc2/rnn_vad/vector_math_avx2_gn",
-        "/third_party/libwebrtc/modules/desktop_capture/desktop_capture_differ_sse2_gn"
-    ]
-
-if CONFIG["MOZ_X11"] == "1" and CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DIRS += [
-        "/third_party/libwebrtc/modules/desktop_capture/desktop_capture_gn",
-        "/third_party/libwebrtc/modules/desktop_capture/primitives_gn"
-    ]
-
-if CONFIG["MOZ_X11"] == "1" and CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "ppc64":
-
-    DIRS += [
-        "/third_party/libwebrtc/modules/desktop_capture/desktop_capture_gn",
-        "/third_party/libwebrtc/modules/desktop_capture/primitives_gn"
-    ]
-
-if CONFIG["MOZ_X11"] == "1" and CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "riscv64":
-
-    DIRS += [
-        "/third_party/libwebrtc/modules/desktop_capture/desktop_capture_gn",
-        "/third_party/libwebrtc/modules/desktop_capture/primitives_gn"
-    ]
diff --git third_party/libwebrtc/net/dcsctp/common/internal_types_gn/moz.build third_party/libwebrtc/net/dcsctp/common/internal_types_gn/moz.build
index e0b6f893fede..9925ef64bda2 100644
--- third_party/libwebrtc/net/dcsctp/common/internal_types_gn/moz.build
+++ third_party/libwebrtc/net/dcsctp/common/internal_types_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("internal_types_gn")
diff --git third_party/libwebrtc/net/dcsctp/common/math_gn/moz.build third_party/libwebrtc/net/dcsctp/common/math_gn/moz.build
index 48e41ba26fd0..ea61b86b2c47 100644
--- third_party/libwebrtc/net/dcsctp/common/math_gn/moz.build
+++ third_party/libwebrtc/net/dcsctp/common/math_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("math_gn")
diff --git third_party/libwebrtc/net/dcsctp/common/sequence_numbers_gn/moz.build third_party/libwebrtc/net/dcsctp/common/sequence_numbers_gn/moz.build
index fa0536b48b8b..b046a4fef9c4 100644
--- third_party/libwebrtc/net/dcsctp/common/sequence_numbers_gn/moz.build
+++ third_party/libwebrtc/net/dcsctp/common/sequence_numbers_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,86 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -159,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("sequence_numbers_gn")
diff --git third_party/libwebrtc/net/dcsctp/packet/bounded_io_gn/moz.build third_party/libwebrtc/net/dcsctp/packet/bounded_io_gn/moz.build
index 71511cce66f2..f069bd7c7954 100644
--- third_party/libwebrtc/net/dcsctp/packet/bounded_io_gn/moz.build
+++ third_party/libwebrtc/net/dcsctp/packet/bounded_io_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,86 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -159,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("bounded_io_gn")
diff --git third_party/libwebrtc/net/dcsctp/packet/chunk_gn/moz.build third_party/libwebrtc/net/dcsctp/packet/chunk_gn/moz.build
index 33b764d15894..4720c29bb75d 100644
--- third_party/libwebrtc/net/dcsctp/packet/chunk_gn/moz.build
+++ third_party/libwebrtc/net/dcsctp/packet/chunk_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -65,97 +74,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -163,82 +82,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("chunk_gn")
diff --git third_party/libwebrtc/net/dcsctp/packet/chunk_validators_gn/moz.build third_party/libwebrtc/net/dcsctp/packet/chunk_validators_gn/moz.build
index 4cd8ba381a70..17106172cc62 100644
--- third_party/libwebrtc/net/dcsctp/packet/chunk_validators_gn/moz.build
+++ third_party/libwebrtc/net/dcsctp/packet/chunk_validators_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("chunk_validators_gn")
diff --git third_party/libwebrtc/net/dcsctp/packet/crc32c_gn/moz.build third_party/libwebrtc/net/dcsctp/packet/crc32c_gn/moz.build
index 2cfefbcab44b..5fed68be417a 100644
--- third_party/libwebrtc/net/dcsctp/packet/crc32c_gn/moz.build
+++ third_party/libwebrtc/net/dcsctp/packet/crc32c_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,82 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("crc32c_gn")
diff --git third_party/libwebrtc/net/dcsctp/packet/data_gn/moz.build third_party/libwebrtc/net/dcsctp/packet/data_gn/moz.build
index 5252b0d5434d..8c03edc3da06 100644
--- third_party/libwebrtc/net/dcsctp/packet/data_gn/moz.build
+++ third_party/libwebrtc/net/dcsctp/packet/data_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,86 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -159,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("data_gn")
diff --git third_party/libwebrtc/net/dcsctp/packet/error_cause_gn/moz.build third_party/libwebrtc/net/dcsctp/packet/error_cause_gn/moz.build
index fd42e6b43c74..bec0a1fe6de0 100644
--- third_party/libwebrtc/net/dcsctp/packet/error_cause_gn/moz.build
+++ third_party/libwebrtc/net/dcsctp/packet/error_cause_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -61,97 +70,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -159,82 +78,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("error_cause_gn")
diff --git third_party/libwebrtc/net/dcsctp/packet/parameter_gn/moz.build third_party/libwebrtc/net/dcsctp/packet/parameter_gn/moz.build
index ee885fffc5e0..0b9aa6a364c4 100644
--- third_party/libwebrtc/net/dcsctp/packet/parameter_gn/moz.build
+++ third_party/libwebrtc/net/dcsctp/packet/parameter_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -59,97 +68,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -157,82 +76,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("parameter_gn")
diff --git third_party/libwebrtc/net/dcsctp/packet/sctp_packet_gn/moz.build third_party/libwebrtc/net/dcsctp/packet/sctp_packet_gn/moz.build
index 646f624c7ea8..d269150fe84f 100644
--- third_party/libwebrtc/net/dcsctp/packet/sctp_packet_gn/moz.build
+++ third_party/libwebrtc/net/dcsctp/packet/sctp_packet_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("sctp_packet_gn")
diff --git third_party/libwebrtc/net/dcsctp/packet/tlv_trait_gn/moz.build third_party/libwebrtc/net/dcsctp/packet/tlv_trait_gn/moz.build
index 8f10c4355d07..b544ce3ae995 100644
--- third_party/libwebrtc/net/dcsctp/packet/tlv_trait_gn/moz.build
+++ third_party/libwebrtc/net/dcsctp/packet/tlv_trait_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("tlv_trait_gn")
diff --git third_party/libwebrtc/net/dcsctp/public/factory_gn/moz.build third_party/libwebrtc/net/dcsctp/public/factory_gn/moz.build
index 732d5643ba86..494e41191129 100644
--- third_party/libwebrtc/net/dcsctp/public/factory_gn/moz.build
+++ third_party/libwebrtc/net/dcsctp/public/factory_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("factory_gn")
diff --git third_party/libwebrtc/net/dcsctp/public/socket_gn/moz.build third_party/libwebrtc/net/dcsctp/public/socket_gn/moz.build
index 8a4428c0d1bf..6a5e0fb27399 100644
--- third_party/libwebrtc/net/dcsctp/public/socket_gn/moz.build
+++ third_party/libwebrtc/net/dcsctp/public/socket_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("socket_gn")
diff --git third_party/libwebrtc/net/dcsctp/public/types_gn/moz.build third_party/libwebrtc/net/dcsctp/public/types_gn/moz.build
index 75813d227222..60f739272e7b 100644
--- third_party/libwebrtc/net/dcsctp/public/types_gn/moz.build
+++ third_party/libwebrtc/net/dcsctp/public/types_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,86 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -159,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("types_gn")
diff --git third_party/libwebrtc/net/dcsctp/rx/data_tracker_gn/moz.build third_party/libwebrtc/net/dcsctp/rx/data_tracker_gn/moz.build
index 66f2eb7cc55b..e08c4cbeb1b2 100644
--- third_party/libwebrtc/net/dcsctp/rx/data_tracker_gn/moz.build
+++ third_party/libwebrtc/net/dcsctp/rx/data_tracker_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("data_tracker_gn")
diff --git third_party/libwebrtc/net/dcsctp/rx/interleaved_reassembly_streams_gn/moz.build third_party/libwebrtc/net/dcsctp/rx/interleaved_reassembly_streams_gn/moz.build
index 42406ecfb53c..cdc694abe4cc 100644
--- third_party/libwebrtc/net/dcsctp/rx/interleaved_reassembly_streams_gn/moz.build
+++ third_party/libwebrtc/net/dcsctp/rx/interleaved_reassembly_streams_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("interleaved_reassembly_streams_gn")
diff --git third_party/libwebrtc/net/dcsctp/rx/reassembly_queue_gn/moz.build third_party/libwebrtc/net/dcsctp/rx/reassembly_queue_gn/moz.build
index 3c5657f97d68..367d3e7b082d 100644
--- third_party/libwebrtc/net/dcsctp/rx/reassembly_queue_gn/moz.build
+++ third_party/libwebrtc/net/dcsctp/rx/reassembly_queue_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("reassembly_queue_gn")
diff --git third_party/libwebrtc/net/dcsctp/rx/reassembly_streams_gn/moz.build third_party/libwebrtc/net/dcsctp/rx/reassembly_streams_gn/moz.build
index 7d36b245db3c..8120e273243b 100644
--- third_party/libwebrtc/net/dcsctp/rx/reassembly_streams_gn/moz.build
+++ third_party/libwebrtc/net/dcsctp/rx/reassembly_streams_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,97 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -170,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("reassembly_streams_gn")
diff --git third_party/libwebrtc/net/dcsctp/rx/traditional_reassembly_streams_gn/moz.build third_party/libwebrtc/net/dcsctp/rx/traditional_reassembly_streams_gn/moz.build
index dad39ef627ff..d3453cfa4799 100644
--- third_party/libwebrtc/net/dcsctp/rx/traditional_reassembly_streams_gn/moz.build
+++ third_party/libwebrtc/net/dcsctp/rx/traditional_reassembly_streams_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("traditional_reassembly_streams_gn")
diff --git third_party/libwebrtc/net/dcsctp/socket/context_gn/moz.build third_party/libwebrtc/net/dcsctp/socket/context_gn/moz.build
index b990acd0c695..886e65b5881f 100644
--- third_party/libwebrtc/net/dcsctp/socket/context_gn/moz.build
+++ third_party/libwebrtc/net/dcsctp/socket/context_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,97 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -170,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("context_gn")
diff --git third_party/libwebrtc/net/dcsctp/socket/dcsctp_socket_gn/moz.build third_party/libwebrtc/net/dcsctp/socket/dcsctp_socket_gn/moz.build
index bf576c66072b..0e0f4b688f07 100644
--- third_party/libwebrtc/net/dcsctp/socket/dcsctp_socket_gn/moz.build
+++ third_party/libwebrtc/net/dcsctp/socket/dcsctp_socket_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -50,97 +59,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -148,82 +67,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("dcsctp_socket_gn")
diff --git third_party/libwebrtc/net/dcsctp/socket/heartbeat_handler_gn/moz.build third_party/libwebrtc/net/dcsctp/socket/heartbeat_handler_gn/moz.build
index 4ea16bd42a8f..a7128466ae5b 100644
--- third_party/libwebrtc/net/dcsctp/socket/heartbeat_handler_gn/moz.build
+++ third_party/libwebrtc/net/dcsctp/socket/heartbeat_handler_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("heartbeat_handler_gn")
diff --git third_party/libwebrtc/net/dcsctp/socket/packet_sender_gn/moz.build third_party/libwebrtc/net/dcsctp/socket/packet_sender_gn/moz.build
index 54a0ac70924a..94f9aa869f65 100644
--- third_party/libwebrtc/net/dcsctp/socket/packet_sender_gn/moz.build
+++ third_party/libwebrtc/net/dcsctp/socket/packet_sender_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("packet_sender_gn")
diff --git third_party/libwebrtc/net/dcsctp/socket/stream_reset_handler_gn/moz.build third_party/libwebrtc/net/dcsctp/socket/stream_reset_handler_gn/moz.build
index 6988c418d07f..66c9fdd6ce8d 100644
--- third_party/libwebrtc/net/dcsctp/socket/stream_reset_handler_gn/moz.build
+++ third_party/libwebrtc/net/dcsctp/socket/stream_reset_handler_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("stream_reset_handler_gn")
diff --git third_party/libwebrtc/net/dcsctp/socket/transmission_control_block_gn/moz.build third_party/libwebrtc/net/dcsctp/socket/transmission_control_block_gn/moz.build
index 5ec31712aabd..9ce612fae528 100644
--- third_party/libwebrtc/net/dcsctp/socket/transmission_control_block_gn/moz.build
+++ third_party/libwebrtc/net/dcsctp/socket/transmission_control_block_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("transmission_control_block_gn")
diff --git third_party/libwebrtc/net/dcsctp/timer/task_queue_timeout_gn/moz.build third_party/libwebrtc/net/dcsctp/timer/task_queue_timeout_gn/moz.build
index 0043a38a91b8..60f5948545a2 100644
--- third_party/libwebrtc/net/dcsctp/timer/task_queue_timeout_gn/moz.build
+++ third_party/libwebrtc/net/dcsctp/timer/task_queue_timeout_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("task_queue_timeout_gn")
diff --git third_party/libwebrtc/net/dcsctp/timer/timer_gn/moz.build third_party/libwebrtc/net/dcsctp/timer/timer_gn/moz.build
index 48332ea87dc1..b895592db2bd 100644
--- third_party/libwebrtc/net/dcsctp/timer/timer_gn/moz.build
+++ third_party/libwebrtc/net/dcsctp/timer/timer_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("timer_gn")
diff --git third_party/libwebrtc/net/dcsctp/tx/outstanding_data_gn/moz.build third_party/libwebrtc/net/dcsctp/tx/outstanding_data_gn/moz.build
index 6580cf036671..9a2742726bc9 100644
--- third_party/libwebrtc/net/dcsctp/tx/outstanding_data_gn/moz.build
+++ third_party/libwebrtc/net/dcsctp/tx/outstanding_data_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("outstanding_data_gn")
diff --git third_party/libwebrtc/net/dcsctp/tx/retransmission_error_counter_gn/moz.build third_party/libwebrtc/net/dcsctp/tx/retransmission_error_counter_gn/moz.build
index 4d1163d23a5e..f57054d3a713 100644
--- third_party/libwebrtc/net/dcsctp/tx/retransmission_error_counter_gn/moz.build
+++ third_party/libwebrtc/net/dcsctp/tx/retransmission_error_counter_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("retransmission_error_counter_gn")
diff --git third_party/libwebrtc/net/dcsctp/tx/retransmission_queue_gn/moz.build third_party/libwebrtc/net/dcsctp/tx/retransmission_queue_gn/moz.build
index 4e9f5dc97955..2c720f1d99a8 100644
--- third_party/libwebrtc/net/dcsctp/tx/retransmission_queue_gn/moz.build
+++ third_party/libwebrtc/net/dcsctp/tx/retransmission_queue_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("retransmission_queue_gn")
diff --git third_party/libwebrtc/net/dcsctp/tx/retransmission_timeout_gn/moz.build third_party/libwebrtc/net/dcsctp/tx/retransmission_timeout_gn/moz.build
index 44dacddd3372..13677c574679 100644
--- third_party/libwebrtc/net/dcsctp/tx/retransmission_timeout_gn/moz.build
+++ third_party/libwebrtc/net/dcsctp/tx/retransmission_timeout_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("retransmission_timeout_gn")
diff --git third_party/libwebrtc/net/dcsctp/tx/rr_send_queue_gn/moz.build third_party/libwebrtc/net/dcsctp/tx/rr_send_queue_gn/moz.build
index 455a4e25c2bd..f4d233b28952 100644
--- third_party/libwebrtc/net/dcsctp/tx/rr_send_queue_gn/moz.build
+++ third_party/libwebrtc/net/dcsctp/tx/rr_send_queue_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("rr_send_queue_gn")
diff --git third_party/libwebrtc/net/dcsctp/tx/send_queue_gn/moz.build third_party/libwebrtc/net/dcsctp/tx/send_queue_gn/moz.build
index 53c552374748..18d4e499c39f 100644
--- third_party/libwebrtc/net/dcsctp/tx/send_queue_gn/moz.build
+++ third_party/libwebrtc/net/dcsctp/tx/send_queue_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,86 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -159,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("send_queue_gn")
diff --git third_party/libwebrtc/net/dcsctp/tx/stream_scheduler_gn/moz.build third_party/libwebrtc/net/dcsctp/tx/stream_scheduler_gn/moz.build
index d5e8592bee4d..c37caacc3e74 100644
--- third_party/libwebrtc/net/dcsctp/tx/stream_scheduler_gn/moz.build
+++ third_party/libwebrtc/net/dcsctp/tx/stream_scheduler_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("stream_scheduler_gn")
diff --git third_party/libwebrtc/rtc_base/async_dns_resolver_gn/moz.build third_party/libwebrtc/rtc_base/async_dns_resolver_gn/moz.build
index 9531436fbe39..6f14effdb76f 100644
--- third_party/libwebrtc/rtc_base/async_dns_resolver_gn/moz.build
+++ third_party/libwebrtc/rtc_base/async_dns_resolver_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,93 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "GLESv2",
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("async_dns_resolver_gn")
diff --git third_party/libwebrtc/rtc_base/async_packet_socket_gn/moz.build third_party/libwebrtc/rtc_base/async_packet_socket_gn/moz.build
index c86ff4f45e56..b6aff480e7ce 100644
--- third_party/libwebrtc/rtc_base/async_packet_socket_gn/moz.build
+++ third_party/libwebrtc/rtc_base/async_packet_socket_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("async_packet_socket_gn")
diff --git third_party/libwebrtc/rtc_base/base64_gn/moz.build third_party/libwebrtc/rtc_base/base64_gn/moz.build
index 650ec0cfb7a4..0d255b158d70 100644
--- third_party/libwebrtc/rtc_base/base64_gn/moz.build
+++ third_party/libwebrtc/rtc_base/base64_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,82 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("base64_gn")
diff --git third_party/libwebrtc/rtc_base/bit_buffer_gn/moz.build third_party/libwebrtc/rtc_base/bit_buffer_gn/moz.build
index b95fd2b62e80..cc53270fcd48 100644
--- third_party/libwebrtc/rtc_base/bit_buffer_gn/moz.build
+++ third_party/libwebrtc/rtc_base/bit_buffer_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("bit_buffer_gn")
diff --git third_party/libwebrtc/rtc_base/bitrate_tracker_gn/moz.build third_party/libwebrtc/rtc_base/bitrate_tracker_gn/moz.build
index 83307a8b9fff..1aa09623ff7b 100644
--- third_party/libwebrtc/rtc_base/bitrate_tracker_gn/moz.build
+++ third_party/libwebrtc/rtc_base/bitrate_tracker_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("bitrate_tracker_gn")
diff --git third_party/libwebrtc/rtc_base/bitstream_reader_gn/moz.build third_party/libwebrtc/rtc_base/bitstream_reader_gn/moz.build
index a9387939390e..a15234290fa5 100644
--- third_party/libwebrtc/rtc_base/bitstream_reader_gn/moz.build
+++ third_party/libwebrtc/rtc_base/bitstream_reader_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("bitstream_reader_gn")
diff --git third_party/libwebrtc/rtc_base/buffer_gn/moz.build third_party/libwebrtc/rtc_base/buffer_gn/moz.build
index 9e5447419665..2e2adf8da4b5 100644
--- third_party/libwebrtc/rtc_base/buffer_gn/moz.build
+++ third_party/libwebrtc/rtc_base/buffer_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,86 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -159,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("buffer_gn")
diff --git third_party/libwebrtc/rtc_base/byte_buffer_gn/moz.build third_party/libwebrtc/rtc_base/byte_buffer_gn/moz.build
index 15629c5ccb22..0b0dd2e776b9 100644
--- third_party/libwebrtc/rtc_base/byte_buffer_gn/moz.build
+++ third_party/libwebrtc/rtc_base/byte_buffer_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("byte_buffer_gn")
diff --git third_party/libwebrtc/rtc_base/byte_order_gn/moz.build third_party/libwebrtc/rtc_base/byte_order_gn/moz.build
index 7b9e63b0feba..50a9875b71c8 100644
--- third_party/libwebrtc/rtc_base/byte_order_gn/moz.build
+++ third_party/libwebrtc/rtc_base/byte_order_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,86 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -159,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("byte_order_gn")
diff --git third_party/libwebrtc/rtc_base/callback_list_gn/moz.build third_party/libwebrtc/rtc_base/callback_list_gn/moz.build
index 0331560383b1..6aa9d35ca2a3 100644
--- third_party/libwebrtc/rtc_base/callback_list_gn/moz.build
+++ third_party/libwebrtc/rtc_base/callback_list_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("callback_list_gn")
diff --git third_party/libwebrtc/rtc_base/callback_list_with_locks_gn/moz.build third_party/libwebrtc/rtc_base/callback_list_with_locks_gn/moz.build
index afb18a807860..781f975ff3f5 100644
--- third_party/libwebrtc/rtc_base/callback_list_with_locks_gn/moz.build
+++ third_party/libwebrtc/rtc_base/callback_list_with_locks_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,86 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -159,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("callback_list_with_locks_gn")
diff --git third_party/libwebrtc/rtc_base/checks_gn/moz.build third_party/libwebrtc/rtc_base/checks_gn/moz.build
index 8a23a3854009..f175170f4c41 100644
--- third_party/libwebrtc/rtc_base/checks_gn/moz.build
+++ third_party/libwebrtc/rtc_base/checks_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("checks_gn")
diff --git third_party/libwebrtc/rtc_base/compile_assert_c_gn/moz.build third_party/libwebrtc/rtc_base/compile_assert_c_gn/moz.build
index d7c2080f3147..30b1965e5f89 100644
--- third_party/libwebrtc/rtc_base/compile_assert_c_gn/moz.build
+++ third_party/libwebrtc/rtc_base/compile_assert_c_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("compile_assert_c_gn")
diff --git third_party/libwebrtc/rtc_base/containers/flat_containers_internal_gn/moz.build third_party/libwebrtc/rtc_base/containers/flat_containers_internal_gn/moz.build
index 9cecccdd5447..a5a6ca00c5a9 100644
--- third_party/libwebrtc/rtc_base/containers/flat_containers_internal_gn/moz.build
+++ third_party/libwebrtc/rtc_base/containers/flat_containers_internal_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("flat_containers_internal_gn")
diff --git third_party/libwebrtc/rtc_base/containers/flat_map_gn/moz.build third_party/libwebrtc/rtc_base/containers/flat_map_gn/moz.build
index eb97276d4f2e..2747576766c9 100644
--- third_party/libwebrtc/rtc_base/containers/flat_map_gn/moz.build
+++ third_party/libwebrtc/rtc_base/containers/flat_map_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,86 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -159,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("flat_map_gn")
diff --git third_party/libwebrtc/rtc_base/containers/flat_set_gn/moz.build third_party/libwebrtc/rtc_base/containers/flat_set_gn/moz.build
index 9abbd8364e25..aafcb8983c24 100644
--- third_party/libwebrtc/rtc_base/containers/flat_set_gn/moz.build
+++ third_party/libwebrtc/rtc_base/containers/flat_set_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,86 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -159,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("flat_set_gn")
diff --git third_party/libwebrtc/rtc_base/copy_on_write_buffer_gn/moz.build third_party/libwebrtc/rtc_base/copy_on_write_buffer_gn/moz.build
index c07b27d87014..4615e462dfcc 100644
--- third_party/libwebrtc/rtc_base/copy_on_write_buffer_gn/moz.build
+++ third_party/libwebrtc/rtc_base/copy_on_write_buffer_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("copy_on_write_buffer_gn")
diff --git third_party/libwebrtc/rtc_base/cpu_info_gn/moz.build third_party/libwebrtc/rtc_base/cpu_info_gn/moz.build
index 083ca9cad468..b0165c26bffe 100644
--- third_party/libwebrtc/rtc_base/cpu_info_gn/moz.build
+++ third_party/libwebrtc/rtc_base/cpu_info_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("cpu_info_gn")
diff --git third_party/libwebrtc/rtc_base/criticalsection_gn/moz.build third_party/libwebrtc/rtc_base/criticalsection_gn/moz.build
index 9d0d16878939..1abaf6c4cc81 100644
--- third_party/libwebrtc/rtc_base/criticalsection_gn/moz.build
+++ third_party/libwebrtc/rtc_base/criticalsection_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("criticalsection_gn")
diff --git third_party/libwebrtc/rtc_base/denormal_disabler_gn/moz.build third_party/libwebrtc/rtc_base/denormal_disabler_gn/moz.build
index 8773cb57bd01..f2bcfffa8c63 100644
--- third_party/libwebrtc/rtc_base/denormal_disabler_gn/moz.build
+++ third_party/libwebrtc/rtc_base/denormal_disabler_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("denormal_disabler_gn")
diff --git third_party/libwebrtc/rtc_base/divide_round_gn/moz.build third_party/libwebrtc/rtc_base/divide_round_gn/moz.build
index 38c94ac76447..e76706b4e660 100644
--- third_party/libwebrtc/rtc_base/divide_round_gn/moz.build
+++ third_party/libwebrtc/rtc_base/divide_round_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,86 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -159,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("divide_round_gn")
diff --git third_party/libwebrtc/rtc_base/dscp_gn/moz.build third_party/libwebrtc/rtc_base/dscp_gn/moz.build
index 8c2d094d4e1b..e0fa95426aac 100644
--- third_party/libwebrtc/rtc_base/dscp_gn/moz.build
+++ third_party/libwebrtc/rtc_base/dscp_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("dscp_gn")
diff --git third_party/libwebrtc/rtc_base/event_tracer_gn/moz.build third_party/libwebrtc/rtc_base/event_tracer_gn/moz.build
index 51aca27a3d1c..b5fe3187bfcf 100644
--- third_party/libwebrtc/rtc_base/event_tracer_gn/moz.build
+++ third_party/libwebrtc/rtc_base/event_tracer_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -49,97 +58,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -147,82 +66,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("event_tracer_gn")
diff --git third_party/libwebrtc/rtc_base/experiments/alr_experiment_gn/moz.build third_party/libwebrtc/rtc_base/experiments/alr_experiment_gn/moz.build
index 24b50928a0e5..3a902f646f0e 100644
--- third_party/libwebrtc/rtc_base/experiments/alr_experiment_gn/moz.build
+++ third_party/libwebrtc/rtc_base/experiments/alr_experiment_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("alr_experiment_gn")
diff --git third_party/libwebrtc/rtc_base/experiments/balanced_degradation_settings_gn/moz.build third_party/libwebrtc/rtc_base/experiments/balanced_degradation_settings_gn/moz.build
index 5f6d88d38557..b15c0c33c997 100644
--- third_party/libwebrtc/rtc_base/experiments/balanced_degradation_settings_gn/moz.build
+++ third_party/libwebrtc/rtc_base/experiments/balanced_degradation_settings_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("balanced_degradation_settings_gn")
diff --git third_party/libwebrtc/rtc_base/experiments/corruption_detection_frame_selector_settings_gn/moz.build third_party/libwebrtc/rtc_base/experiments/corruption_detection_frame_selector_settings_gn/moz.build
index e42552b3e8a9..66cf7c15a19d 100644
--- third_party/libwebrtc/rtc_base/experiments/corruption_detection_frame_selector_settings_gn/moz.build
+++ third_party/libwebrtc/rtc_base/experiments/corruption_detection_frame_selector_settings_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("corruption_detection_frame_selector_settings_gn")
diff --git third_party/libwebrtc/rtc_base/experiments/encoder_info_settings_gn/moz.build third_party/libwebrtc/rtc_base/experiments/encoder_info_settings_gn/moz.build
index 421f33f873a8..5858750ed81e 100644
--- third_party/libwebrtc/rtc_base/experiments/encoder_info_settings_gn/moz.build
+++ third_party/libwebrtc/rtc_base/experiments/encoder_info_settings_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("encoder_info_settings_gn")
diff --git third_party/libwebrtc/rtc_base/experiments/encoder_speed_experiment_gn/moz.build third_party/libwebrtc/rtc_base/experiments/encoder_speed_experiment_gn/moz.build
index 5a392d7fdfe7..13ac3b8d5a75 100644
--- third_party/libwebrtc/rtc_base/experiments/encoder_speed_experiment_gn/moz.build
+++ third_party/libwebrtc/rtc_base/experiments/encoder_speed_experiment_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("encoder_speed_experiment_gn")
diff --git third_party/libwebrtc/rtc_base/experiments/field_trial_parser_gn/moz.build third_party/libwebrtc/rtc_base/experiments/field_trial_parser_gn/moz.build
index e3b7531c90cc..0fbb193fad20 100644
--- third_party/libwebrtc/rtc_base/experiments/field_trial_parser_gn/moz.build
+++ third_party/libwebrtc/rtc_base/experiments/field_trial_parser_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -51,97 +60,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -149,82 +68,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("field_trial_parser_gn")
diff --git third_party/libwebrtc/rtc_base/experiments/keyframe_interval_settings_experiment_gn/moz.build third_party/libwebrtc/rtc_base/experiments/keyframe_interval_settings_experiment_gn/moz.build
index 5ad098dc8475..dd1810bafeb5 100644
--- third_party/libwebrtc/rtc_base/experiments/keyframe_interval_settings_experiment_gn/moz.build
+++ third_party/libwebrtc/rtc_base/experiments/keyframe_interval_settings_experiment_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("keyframe_interval_settings_experiment_gn")
diff --git third_party/libwebrtc/rtc_base/experiments/min_video_bitrate_experiment_gn/moz.build third_party/libwebrtc/rtc_base/experiments/min_video_bitrate_experiment_gn/moz.build
index 9ddb4b8b2be9..218388b131e0 100644
--- third_party/libwebrtc/rtc_base/experiments/min_video_bitrate_experiment_gn/moz.build
+++ third_party/libwebrtc/rtc_base/experiments/min_video_bitrate_experiment_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("min_video_bitrate_experiment_gn")
diff --git third_party/libwebrtc/rtc_base/experiments/normalize_simulcast_size_experiment_gn/moz.build third_party/libwebrtc/rtc_base/experiments/normalize_simulcast_size_experiment_gn/moz.build
index b2aa362701da..4cdbbd2fd9cc 100644
--- third_party/libwebrtc/rtc_base/experiments/normalize_simulcast_size_experiment_gn/moz.build
+++ third_party/libwebrtc/rtc_base/experiments/normalize_simulcast_size_experiment_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("normalize_simulcast_size_experiment_gn")
diff --git third_party/libwebrtc/rtc_base/experiments/quality_scaler_settings_gn/moz.build third_party/libwebrtc/rtc_base/experiments/quality_scaler_settings_gn/moz.build
index cc70fd6b2077..15e9f76795cb 100644
--- third_party/libwebrtc/rtc_base/experiments/quality_scaler_settings_gn/moz.build
+++ third_party/libwebrtc/rtc_base/experiments/quality_scaler_settings_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("quality_scaler_settings_gn")
diff --git third_party/libwebrtc/rtc_base/experiments/quality_scaling_experiment_gn/moz.build third_party/libwebrtc/rtc_base/experiments/quality_scaling_experiment_gn/moz.build
index f899be0baccf..3680ade15bcd 100644
--- third_party/libwebrtc/rtc_base/experiments/quality_scaling_experiment_gn/moz.build
+++ third_party/libwebrtc/rtc_base/experiments/quality_scaling_experiment_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("quality_scaling_experiment_gn")
diff --git third_party/libwebrtc/rtc_base/experiments/rate_control_settings_gn/moz.build third_party/libwebrtc/rtc_base/experiments/rate_control_settings_gn/moz.build
index 2f88f49772f1..b7d2f1e31fae 100644
--- third_party/libwebrtc/rtc_base/experiments/rate_control_settings_gn/moz.build
+++ third_party/libwebrtc/rtc_base/experiments/rate_control_settings_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("rate_control_settings_gn")
diff --git third_party/libwebrtc/rtc_base/frequency_tracker_gn/moz.build third_party/libwebrtc/rtc_base/frequency_tracker_gn/moz.build
index d8df9447387c..ab52b56d50fe 100644
--- third_party/libwebrtc/rtc_base/frequency_tracker_gn/moz.build
+++ third_party/libwebrtc/rtc_base/frequency_tracker_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("frequency_tracker_gn")
diff --git third_party/libwebrtc/rtc_base/gtest_prod_gn/moz.build third_party/libwebrtc/rtc_base/gtest_prod_gn/moz.build
index a8bd3a2f8e73..b40f8278faec 100644
--- third_party/libwebrtc/rtc_base/gtest_prod_gn/moz.build
+++ third_party/libwebrtc/rtc_base/gtest_prod_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("gtest_prod_gn")
diff --git third_party/libwebrtc/rtc_base/histogram_percentile_counter_gn/moz.build third_party/libwebrtc/rtc_base/histogram_percentile_counter_gn/moz.build
index b7599e152883..2e953290ee47 100644
--- third_party/libwebrtc/rtc_base/histogram_percentile_counter_gn/moz.build
+++ third_party/libwebrtc/rtc_base/histogram_percentile_counter_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("histogram_percentile_counter_gn")
diff --git third_party/libwebrtc/rtc_base/ifaddrs_android_gn/moz.build third_party/libwebrtc/rtc_base/ifaddrs_android_gn/moz.build
deleted file mode 100644
index 1bfb4e480972..000000000000
--- third_party/libwebrtc/rtc_base/ifaddrs_android_gn/moz.build
+++ /dev/null
@@ -1,97 +0,0 @@
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-
-  ### This moz.build was AUTOMATICALLY GENERATED from a GN config,  ###
-  ### DO NOT edit it by hand.                                       ###
-
-COMPILE_FLAGS["OS_INCLUDES"] = []
-AllowCompilerWarnings()
-
-DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
-DEFINES["ANDROID"] = True
-DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-DEFINES["HAVE_SYS_UIO_H"] = True
-DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
-DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
-DEFINES["RTC_ENABLE_VP9"] = True
-DEFINES["WEBRTC_ANDROID"] = True
-DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
-DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
-DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
-DEFINES["WEBRTC_LIBRARY_IMPL"] = True
-DEFINES["WEBRTC_LINUX"] = True
-DEFINES["WEBRTC_MOZILLA_BUILD"] = True
-DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
-DEFINES["WEBRTC_POSIX"] = True
-DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
-DEFINES["WEBRTC_WITHOUT_RUST"] = True
-DEFINES["_GNU_SOURCE"] = True
-DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-DEFINES["__STDC_CONSTANT_MACROS"] = True
-DEFINES["__STDC_FORMAT_MACROS"] = True
-
-FINAL_LIBRARY = "xul"
-
-
-LOCAL_INCLUDES += [
-    "!/dist/include/libwebrtc_overrides",
-    "!/ipc/ipdl/_ipdlheaders",
-    "!/third_party/libwebrtc/gen",
-    "/ipc/chromium/src",
-    "/third_party/abseil-cpp/",
-    "/third_party/libwebrtc/",
-    "/tools/profiler/public"
-]
-
-OS_LIBS += [
-    "GLESv2",
-    "log"
-]
-
-UNIFIED_SOURCES += [
-    "/third_party/libwebrtc/rtc_base/ifaddrs_android.cc"
-]
-
-if not CONFIG["MOZ_DEBUG"]:
-
-    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "0"
-    DEFINES["NDEBUG"] = True
-    DEFINES["NVALGRIND"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1":
-
-    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["WEBRTC_ARCH_ARM64"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-    DEFINES["__ARM_NEON__"] = "1"
-
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-Library("ifaddrs_android_gn")
diff --git third_party/libwebrtc/rtc_base/ignore_wundef_gn/moz.build third_party/libwebrtc/rtc_base/ignore_wundef_gn/moz.build
index 23492eb41005..e7a5916acf14 100644
--- third_party/libwebrtc/rtc_base/ignore_wundef_gn/moz.build
+++ third_party/libwebrtc/rtc_base/ignore_wundef_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("ignore_wundef_gn")
diff --git third_party/libwebrtc/rtc_base/ip_address_gn/moz.build third_party/libwebrtc/rtc_base/ip_address_gn/moz.build
index a701d70e5c4a..0448cd40b23e 100644
--- third_party/libwebrtc/rtc_base/ip_address_gn/moz.build
+++ third_party/libwebrtc/rtc_base/ip_address_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,93 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "GLESv2",
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("ip_address_gn")
diff --git third_party/libwebrtc/rtc_base/logging_gn/moz.build third_party/libwebrtc/rtc_base/logging_gn/moz.build
index 507a1037a81d..9398ef1ba7ec 100644
--- third_party/libwebrtc/rtc_base/logging_gn/moz.build
+++ third_party/libwebrtc/rtc_base/logging_gn/moz.build
@@ -13,15 +13,24 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
 DEFINES["WEBRTC_APM_DEBUG_DUMP"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -49,97 +58,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -147,82 +66,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("logging_gn")
diff --git third_party/libwebrtc/rtc_base/macromagic_gn/moz.build third_party/libwebrtc/rtc_base/macromagic_gn/moz.build
index cb1e2ed88c89..d3fa29d0740f 100644
--- third_party/libwebrtc/rtc_base/macromagic_gn/moz.build
+++ third_party/libwebrtc/rtc_base/macromagic_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("macromagic_gn")
diff --git third_party/libwebrtc/rtc_base/memory/aligned_malloc_gn/moz.build third_party/libwebrtc/rtc_base/memory/aligned_malloc_gn/moz.build
index db3a3f7e77c1..e916aeec1d7c 100644
--- third_party/libwebrtc/rtc_base/memory/aligned_malloc_gn/moz.build
+++ third_party/libwebrtc/rtc_base/memory/aligned_malloc_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("aligned_malloc_gn")
diff --git third_party/libwebrtc/rtc_base/mod_ops_gn/moz.build third_party/libwebrtc/rtc_base/mod_ops_gn/moz.build
index 7b1c143f1da7..75811c33b6b2 100644
--- third_party/libwebrtc/rtc_base/mod_ops_gn/moz.build
+++ third_party/libwebrtc/rtc_base/mod_ops_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,86 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -159,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("mod_ops_gn")
diff --git third_party/libwebrtc/rtc_base/moving_max_counter_gn/moz.build third_party/libwebrtc/rtc_base/moving_max_counter_gn/moz.build
index e3e6cac3f18b..7e866276f611 100644
--- third_party/libwebrtc/rtc_base/moving_max_counter_gn/moz.build
+++ third_party/libwebrtc/rtc_base/moving_max_counter_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,86 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -159,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("moving_max_counter_gn")
diff --git third_party/libwebrtc/rtc_base/net_helpers_gn/moz.build third_party/libwebrtc/rtc_base/net_helpers_gn/moz.build
index 177787c81308..caba5d278dda 100644
--- third_party/libwebrtc/rtc_base/net_helpers_gn/moz.build
+++ third_party/libwebrtc/rtc_base/net_helpers_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,93 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "GLESv2",
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("net_helpers_gn")
diff --git third_party/libwebrtc/rtc_base/network/sent_packet_gn/moz.build third_party/libwebrtc/rtc_base/network/sent_packet_gn/moz.build
index 71427330d234..dec2631eacb1 100644
--- third_party/libwebrtc/rtc_base/network/sent_packet_gn/moz.build
+++ third_party/libwebrtc/rtc_base/network/sent_packet_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,82 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("sent_packet_gn")
diff --git third_party/libwebrtc/rtc_base/network_constants_gn/moz.build third_party/libwebrtc/rtc_base/network_constants_gn/moz.build
index fe5213c62ddd..6f59dacc258e 100644
--- third_party/libwebrtc/rtc_base/network_constants_gn/moz.build
+++ third_party/libwebrtc/rtc_base/network_constants_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("network_constants_gn")
diff --git third_party/libwebrtc/rtc_base/network_route_gn/moz.build third_party/libwebrtc/rtc_base/network_route_gn/moz.build
index b3ee6a890fb0..1ff7c4832897 100644
--- third_party/libwebrtc/rtc_base/network_route_gn/moz.build
+++ third_party/libwebrtc/rtc_base/network_route_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("network_route_gn")
diff --git third_party/libwebrtc/rtc_base/null_socket_server_gn/moz.build third_party/libwebrtc/rtc_base/null_socket_server_gn/moz.build
index b3c719f888a0..45599d37af59 100644
--- third_party/libwebrtc/rtc_base/null_socket_server_gn/moz.build
+++ third_party/libwebrtc/rtc_base/null_socket_server_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,93 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "GLESv2",
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("null_socket_server_gn")
diff --git third_party/libwebrtc/rtc_base/one_time_event_gn/moz.build third_party/libwebrtc/rtc_base/one_time_event_gn/moz.build
index 072d24e4242f..8eaf8bf68a51 100644
--- third_party/libwebrtc/rtc_base/one_time_event_gn/moz.build
+++ third_party/libwebrtc/rtc_base/one_time_event_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,86 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -159,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("one_time_event_gn")
diff --git third_party/libwebrtc/rtc_base/platform_thread_gn/moz.build third_party/libwebrtc/rtc_base/platform_thread_gn/moz.build
index 1cc50e67310d..27ca15219d1e 100644
--- third_party/libwebrtc/rtc_base/platform_thread_gn/moz.build
+++ third_party/libwebrtc/rtc_base/platform_thread_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("platform_thread_gn")
diff --git third_party/libwebrtc/rtc_base/platform_thread_types_gn/moz.build third_party/libwebrtc/rtc_base/platform_thread_types_gn/moz.build
index b1cd1d68734b..df172ddeaf12 100644
--- third_party/libwebrtc/rtc_base/platform_thread_types_gn/moz.build
+++ third_party/libwebrtc/rtc_base/platform_thread_types_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("platform_thread_types_gn")
diff --git third_party/libwebrtc/rtc_base/protobuf_utils_gn/moz.build third_party/libwebrtc/rtc_base/protobuf_utils_gn/moz.build
index c0e2242a0be0..550fa0cdbe4b 100644
--- third_party/libwebrtc/rtc_base/protobuf_utils_gn/moz.build
+++ third_party/libwebrtc/rtc_base/protobuf_utils_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("protobuf_utils_gn")
diff --git third_party/libwebrtc/rtc_base/race_checker_gn/moz.build third_party/libwebrtc/rtc_base/race_checker_gn/moz.build
index b3b8323a5bcc..de25e2230b90 100644
--- third_party/libwebrtc/rtc_base/race_checker_gn/moz.build
+++ third_party/libwebrtc/rtc_base/race_checker_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("race_checker_gn")
diff --git third_party/libwebrtc/rtc_base/random_gn/moz.build third_party/libwebrtc/rtc_base/random_gn/moz.build
index b5d9072583de..1c4f681a4f0e 100644
--- third_party/libwebrtc/rtc_base/random_gn/moz.build
+++ third_party/libwebrtc/rtc_base/random_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("random_gn")
diff --git third_party/libwebrtc/rtc_base/rate_limiter_gn/moz.build third_party/libwebrtc/rtc_base/rate_limiter_gn/moz.build
index 3dc378259281..e480a0295dca 100644
--- third_party/libwebrtc/rtc_base/rate_limiter_gn/moz.build
+++ third_party/libwebrtc/rtc_base/rate_limiter_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("rate_limiter_gn")
diff --git third_party/libwebrtc/rtc_base/rate_statistics_gn/moz.build third_party/libwebrtc/rtc_base/rate_statistics_gn/moz.build
index 38debcb4c20d..6c046bb323be 100644
--- third_party/libwebrtc/rtc_base/rate_statistics_gn/moz.build
+++ third_party/libwebrtc/rtc_base/rate_statistics_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("rate_statistics_gn")
diff --git third_party/libwebrtc/rtc_base/rate_tracker_gn/moz.build third_party/libwebrtc/rtc_base/rate_tracker_gn/moz.build
index 6d0eaa9b535f..5f3a73a38e45 100644
--- third_party/libwebrtc/rtc_base/rate_tracker_gn/moz.build
+++ third_party/libwebrtc/rtc_base/rate_tracker_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("rate_tracker_gn")
diff --git third_party/libwebrtc/rtc_base/refcount_gn/moz.build third_party/libwebrtc/rtc_base/refcount_gn/moz.build
index e7cd1e9208a3..50ff0cec805b 100644
--- third_party/libwebrtc/rtc_base/refcount_gn/moz.build
+++ third_party/libwebrtc/rtc_base/refcount_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("refcount_gn")
diff --git third_party/libwebrtc/rtc_base/rolling_accumulator_gn/moz.build third_party/libwebrtc/rtc_base/rolling_accumulator_gn/moz.build
index 109f2ed8cf31..9a5904be3dfd 100644
--- third_party/libwebrtc/rtc_base/rolling_accumulator_gn/moz.build
+++ third_party/libwebrtc/rtc_base/rolling_accumulator_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,86 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -159,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("rolling_accumulator_gn")
diff --git third_party/libwebrtc/rtc_base/rtc_event_gn/moz.build third_party/libwebrtc/rtc_base/rtc_event_gn/moz.build
index b9c88d4afa7f..06db2e861b49 100644
--- third_party/libwebrtc/rtc_base/rtc_event_gn/moz.build
+++ third_party/libwebrtc/rtc_base/rtc_event_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("rtc_event_gn")
diff --git third_party/libwebrtc/rtc_base/rtc_numerics_gn/moz.build third_party/libwebrtc/rtc_base/rtc_numerics_gn/moz.build
index a7a0d176d3ac..309a197c7e3a 100644
--- third_party/libwebrtc/rtc_base/rtc_numerics_gn/moz.build
+++ third_party/libwebrtc/rtc_base/rtc_numerics_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -50,86 +59,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -137,82 +67,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("rtc_numerics_gn")
diff --git third_party/libwebrtc/rtc_base/rtp_to_ntp_estimator_gn/moz.build third_party/libwebrtc/rtc_base/rtp_to_ntp_estimator_gn/moz.build
index 72affdbeba39..ec9343544f77 100644
--- third_party/libwebrtc/rtc_base/rtp_to_ntp_estimator_gn/moz.build
+++ third_party/libwebrtc/rtc_base/rtp_to_ntp_estimator_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("rtp_to_ntp_estimator_gn")
diff --git third_party/libwebrtc/rtc_base/safe_compare_gn/moz.build third_party/libwebrtc/rtc_base/safe_compare_gn/moz.build
index 41a8498aecbe..f10698ce8da8 100644
--- third_party/libwebrtc/rtc_base/safe_compare_gn/moz.build
+++ third_party/libwebrtc/rtc_base/safe_compare_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("safe_compare_gn")
diff --git third_party/libwebrtc/rtc_base/safe_conversions_gn/moz.build third_party/libwebrtc/rtc_base/safe_conversions_gn/moz.build
index f9d91746e24d..7113b4edc5ef 100644
--- third_party/libwebrtc/rtc_base/safe_conversions_gn/moz.build
+++ third_party/libwebrtc/rtc_base/safe_conversions_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,86 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -159,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("safe_conversions_gn")
diff --git third_party/libwebrtc/rtc_base/safe_minmax_gn/moz.build third_party/libwebrtc/rtc_base/safe_minmax_gn/moz.build
index 0033190e44f4..323791ee1df5 100644
--- third_party/libwebrtc/rtc_base/safe_minmax_gn/moz.build
+++ third_party/libwebrtc/rtc_base/safe_minmax_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,86 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -159,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("safe_minmax_gn")
diff --git third_party/libwebrtc/rtc_base/sample_counter_gn/moz.build third_party/libwebrtc/rtc_base/sample_counter_gn/moz.build
index bc70c2bd0c8d..d1547d0cc4b1 100644
--- third_party/libwebrtc/rtc_base/sample_counter_gn/moz.build
+++ third_party/libwebrtc/rtc_base/sample_counter_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("sample_counter_gn")
diff --git third_party/libwebrtc/rtc_base/sanitizer_gn/moz.build third_party/libwebrtc/rtc_base/sanitizer_gn/moz.build
index a43136532552..2992d7ba7843 100644
--- third_party/libwebrtc/rtc_base/sanitizer_gn/moz.build
+++ third_party/libwebrtc/rtc_base/sanitizer_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("sanitizer_gn")
diff --git third_party/libwebrtc/rtc_base/socket_address_gn/moz.build third_party/libwebrtc/rtc_base/socket_address_gn/moz.build
index ddde12a6bf6c..f85b1066b1a5 100644
--- third_party/libwebrtc/rtc_base/socket_address_gn/moz.build
+++ third_party/libwebrtc/rtc_base/socket_address_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,93 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "GLESv2",
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("socket_address_gn")
diff --git third_party/libwebrtc/rtc_base/socket_factory_gn/moz.build third_party/libwebrtc/rtc_base/socket_factory_gn/moz.build
index bf2c7b309eaa..feb5fb72beee 100644
--- third_party/libwebrtc/rtc_base/socket_factory_gn/moz.build
+++ third_party/libwebrtc/rtc_base/socket_factory_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,93 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "GLESv2",
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -138,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -166,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("socket_factory_gn")
diff --git third_party/libwebrtc/rtc_base/socket_gn/moz.build third_party/libwebrtc/rtc_base/socket_gn/moz.build
index 74e9f4aed773..ba45670c9748 100644
--- third_party/libwebrtc/rtc_base/socket_gn/moz.build
+++ third_party/libwebrtc/rtc_base/socket_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,93 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "GLESv2",
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("socket_gn")
diff --git third_party/libwebrtc/rtc_base/socket_server_gn/moz.build third_party/libwebrtc/rtc_base/socket_server_gn/moz.build
index 405a1e5ab8bd..9dbbb34ba513 100644
--- third_party/libwebrtc/rtc_base/socket_server_gn/moz.build
+++ third_party/libwebrtc/rtc_base/socket_server_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,93 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "GLESv2",
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -138,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -166,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("socket_server_gn")
diff --git third_party/libwebrtc/rtc_base/span_helpers_gn/moz.build third_party/libwebrtc/rtc_base/span_helpers_gn/moz.build
index b312070fba2b..a5dbce389452 100644
--- third_party/libwebrtc/rtc_base/span_helpers_gn/moz.build
+++ third_party/libwebrtc/rtc_base/span_helpers_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("span_helpers_gn")
diff --git third_party/libwebrtc/rtc_base/ssl_adapter_gn/moz.build third_party/libwebrtc/rtc_base/ssl_adapter_gn/moz.build
index a6b1bdc53acc..6c879d9b3fe9 100644
--- third_party/libwebrtc/rtc_base/ssl_adapter_gn/moz.build
+++ third_party/libwebrtc/rtc_base/ssl_adapter_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("ssl_adapter_gn")
diff --git third_party/libwebrtc/rtc_base/stringutils_gn/moz.build third_party/libwebrtc/rtc_base/stringutils_gn/moz.build
index 7b8f5761a34d..b70cdf31bae7 100644
--- third_party/libwebrtc/rtc_base/stringutils_gn/moz.build
+++ third_party/libwebrtc/rtc_base/stringutils_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -52,86 +61,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -139,82 +69,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("stringutils_gn")
diff --git third_party/libwebrtc/rtc_base/strong_alias_gn/moz.build third_party/libwebrtc/rtc_base/strong_alias_gn/moz.build
index d4e0f56039cb..df3b3b67f372 100644
--- third_party/libwebrtc/rtc_base/strong_alias_gn/moz.build
+++ third_party/libwebrtc/rtc_base/strong_alias_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("strong_alias_gn")
diff --git third_party/libwebrtc/rtc_base/swap_queue_gn/moz.build third_party/libwebrtc/rtc_base/swap_queue_gn/moz.build
index cbb5e26f1005..8f4532654f28 100644
--- third_party/libwebrtc/rtc_base/swap_queue_gn/moz.build
+++ third_party/libwebrtc/rtc_base/swap_queue_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,86 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -159,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("swap_queue_gn")
diff --git third_party/libwebrtc/rtc_base/synchronization/mutex_gn/moz.build third_party/libwebrtc/rtc_base/synchronization/mutex_gn/moz.build
index ff35ac878e57..679f63d0b874 100644
--- third_party/libwebrtc/rtc_base/synchronization/mutex_gn/moz.build
+++ third_party/libwebrtc/rtc_base/synchronization/mutex_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,86 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -159,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("mutex_gn")
diff --git third_party/libwebrtc/rtc_base/synchronization/sequence_checker_internal_gn/moz.build third_party/libwebrtc/rtc_base/synchronization/sequence_checker_internal_gn/moz.build
index 57b17cf9e0f6..b677da25a051 100644
--- third_party/libwebrtc/rtc_base/synchronization/sequence_checker_internal_gn/moz.build
+++ third_party/libwebrtc/rtc_base/synchronization/sequence_checker_internal_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("sequence_checker_internal_gn")
diff --git third_party/libwebrtc/rtc_base/synchronization/yield_policy_gn/moz.build third_party/libwebrtc/rtc_base/synchronization/yield_policy_gn/moz.build
index 8c13b5b690e8..1090d9aafa01 100644
--- third_party/libwebrtc/rtc_base/synchronization/yield_policy_gn/moz.build
+++ third_party/libwebrtc/rtc_base/synchronization/yield_policy_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,82 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("yield_policy_gn")
diff --git third_party/libwebrtc/rtc_base/system/arch_gn/moz.build third_party/libwebrtc/rtc_base/system/arch_gn/moz.build
index 35ef93d1eacc..72c0a875584a 100644
--- third_party/libwebrtc/rtc_base/system/arch_gn/moz.build
+++ third_party/libwebrtc/rtc_base/system/arch_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("arch_gn")
diff --git third_party/libwebrtc/rtc_base/system/asm_defines_gn/moz.build third_party/libwebrtc/rtc_base/system/asm_defines_gn/moz.build
deleted file mode 100644
index 02d3e3dcae37..000000000000
--- third_party/libwebrtc/rtc_base/system/asm_defines_gn/moz.build
+++ /dev/null
@@ -1,76 +0,0 @@
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-
-  ### This moz.build was AUTOMATICALLY GENERATED from a GN config,  ###
-  ### DO NOT edit it by hand.                                       ###
-
-COMPILE_FLAGS["OS_INCLUDES"] = []
-AllowCompilerWarnings()
-
-DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
-DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
-DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
-DEFINES["RTC_ENABLE_VP9"] = True
-DEFINES["WEBRTC_ARCH_ARM"] = True
-DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
-DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
-DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
-DEFINES["WEBRTC_HAS_NEON"] = True
-DEFINES["WEBRTC_LIBRARY_IMPL"] = True
-DEFINES["WEBRTC_LINUX"] = True
-DEFINES["WEBRTC_MOZILLA_BUILD"] = True
-DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
-DEFINES["WEBRTC_POSIX"] = True
-DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
-DEFINES["WEBRTC_WITHOUT_RUST"] = True
-DEFINES["_GNU_SOURCE"] = True
-DEFINES["__STDC_CONSTANT_MACROS"] = True
-DEFINES["__STDC_FORMAT_MACROS"] = True
-
-FINAL_LIBRARY = "xul"
-
-
-LOCAL_INCLUDES += [
-    "!/dist/include/libwebrtc_overrides",
-    "!/ipc/ipdl/_ipdlheaders",
-    "!/third_party/libwebrtc/gen",
-    "/ipc/chromium/src",
-    "/third_party/abseil-cpp/",
-    "/third_party/libwebrtc/",
-    "/tools/profiler/public"
-]
-
-if not CONFIG["MOZ_DEBUG"]:
-
-    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "0"
-    DEFINES["NDEBUG"] = True
-    DEFINES["NVALGRIND"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1":
-
-    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-
-Library("asm_defines_gn")
diff --git third_party/libwebrtc/rtc_base/system/assume_gn/moz.build third_party/libwebrtc/rtc_base/system/assume_gn/moz.build
index a0fb21ae7e00..9f3929119e78 100644
--- third_party/libwebrtc/rtc_base/system/assume_gn/moz.build
+++ third_party/libwebrtc/rtc_base/system/assume_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("assume_gn")
diff --git third_party/libwebrtc/rtc_base/system/cocoa_threading_gn/moz.build third_party/libwebrtc/rtc_base/system/cocoa_threading_gn/moz.build
deleted file mode 100644
index 788923cdceea..000000000000
--- third_party/libwebrtc/rtc_base/system/cocoa_threading_gn/moz.build
+++ /dev/null
@@ -1,75 +0,0 @@
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-
-  ### This moz.build was AUTOMATICALLY GENERATED from a GN config,  ###
-  ### DO NOT edit it by hand.                                       ###
-
-CMMFLAGS += [
-    "-fobjc-arc"
-]
-
-COMPILE_FLAGS["OS_INCLUDES"] = []
-AllowCompilerWarnings()
-
-DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
-DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
-DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
-DEFINES["RTC_ENABLE_VP9"] = True
-DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
-DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
-DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
-DEFINES["WEBRTC_LIBRARY_IMPL"] = True
-DEFINES["WEBRTC_MAC"] = True
-DEFINES["WEBRTC_MOZILLA_BUILD"] = True
-DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
-DEFINES["WEBRTC_POSIX"] = True
-DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
-DEFINES["WEBRTC_WITHOUT_RUST"] = True
-DEFINES["__STDC_CONSTANT_MACROS"] = True
-DEFINES["__STDC_FORMAT_MACROS"] = True
-
-FINAL_LIBRARY = "xul"
-
-
-LOCAL_INCLUDES += [
-    "!/dist/include/libwebrtc_overrides",
-    "!/ipc/ipdl/_ipdlheaders",
-    "!/third_party/libwebrtc/gen",
-    "/ipc/chromium/src",
-    "/third_party/abseil-cpp/",
-    "/third_party/libwebrtc/",
-    "/tools/profiler/public"
-]
-
-OS_LIBS += [
-    "-framework Foundation"
-]
-
-UNIFIED_SOURCES += [
-    "/third_party/libwebrtc/rtc_base/system/cocoa_threading.mm"
-]
-
-if not CONFIG["MOZ_DEBUG"]:
-
-    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "0"
-    DEFINES["NDEBUG"] = True
-    DEFINES["NVALGRIND"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1":
-
-    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["WEBRTC_ARCH_ARM64"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-    DEFINES["__ARM_NEON__"] = "1"
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-Library("cocoa_threading_gn")
diff --git third_party/libwebrtc/rtc_base/system/file_wrapper_gn/moz.build third_party/libwebrtc/rtc_base/system/file_wrapper_gn/moz.build
index 5bb7e7969c00..2d430045ab7c 100644
--- third_party/libwebrtc/rtc_base/system/file_wrapper_gn/moz.build
+++ third_party/libwebrtc/rtc_base/system/file_wrapper_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("file_wrapper_gn")
diff --git third_party/libwebrtc/rtc_base/system/gcd_helpers_gn/moz.build third_party/libwebrtc/rtc_base/system/gcd_helpers_gn/moz.build
deleted file mode 100644
index fc276797b270..000000000000
--- third_party/libwebrtc/rtc_base/system/gcd_helpers_gn/moz.build
+++ /dev/null
@@ -1,71 +0,0 @@
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-
-  ### This moz.build was AUTOMATICALLY GENERATED from a GN config,  ###
-  ### DO NOT edit it by hand.                                       ###
-
-CMFLAGS += [
-    "-fobjc-arc"
-]
-
-COMPILE_FLAGS["OS_INCLUDES"] = []
-AllowCompilerWarnings()
-
-DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
-DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
-DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
-DEFINES["RTC_ENABLE_VP9"] = True
-DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
-DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
-DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
-DEFINES["WEBRTC_LIBRARY_IMPL"] = True
-DEFINES["WEBRTC_MAC"] = True
-DEFINES["WEBRTC_MOZILLA_BUILD"] = True
-DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
-DEFINES["WEBRTC_POSIX"] = True
-DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
-DEFINES["WEBRTC_WITHOUT_RUST"] = True
-DEFINES["__STDC_CONSTANT_MACROS"] = True
-DEFINES["__STDC_FORMAT_MACROS"] = True
-
-FINAL_LIBRARY = "xul"
-
-
-LOCAL_INCLUDES += [
-    "!/dist/include/libwebrtc_overrides",
-    "!/ipc/ipdl/_ipdlheaders",
-    "!/third_party/libwebrtc/gen",
-    "/ipc/chromium/src",
-    "/third_party/abseil-cpp/",
-    "/third_party/libwebrtc/",
-    "/tools/profiler/public"
-]
-
-UNIFIED_SOURCES += [
-    "/third_party/libwebrtc/rtc_base/system/gcd_helpers.m"
-]
-
-if not CONFIG["MOZ_DEBUG"]:
-
-    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "0"
-    DEFINES["NDEBUG"] = True
-    DEFINES["NVALGRIND"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1":
-
-    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["WEBRTC_ARCH_ARM64"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-    DEFINES["__ARM_NEON__"] = "1"
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-Library("gcd_helpers_gn")
diff --git third_party/libwebrtc/rtc_base/system/ignore_warnings_gn/moz.build third_party/libwebrtc/rtc_base/system/ignore_warnings_gn/moz.build
index 88d026de3257..b4d3a890ed00 100644
--- third_party/libwebrtc/rtc_base/system/ignore_warnings_gn/moz.build
+++ third_party/libwebrtc/rtc_base/system/ignore_warnings_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("ignore_warnings_gn")
diff --git third_party/libwebrtc/rtc_base/system/inline_gn/moz.build third_party/libwebrtc/rtc_base/system/inline_gn/moz.build
index 077766b6b854..1989ceeb9d08 100644
--- third_party/libwebrtc/rtc_base/system/inline_gn/moz.build
+++ third_party/libwebrtc/rtc_base/system/inline_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("inline_gn")
diff --git third_party/libwebrtc/rtc_base/system/no_unique_address_gn/moz.build third_party/libwebrtc/rtc_base/system/no_unique_address_gn/moz.build
index 47b1385d12c6..487321de8067 100644
--- third_party/libwebrtc/rtc_base/system/no_unique_address_gn/moz.build
+++ third_party/libwebrtc/rtc_base/system/no_unique_address_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("no_unique_address_gn")
diff --git third_party/libwebrtc/rtc_base/system/rtc_export_gn/moz.build third_party/libwebrtc/rtc_base/system/rtc_export_gn/moz.build
index 3ee9505b03db..1ce82f2c7b17 100644
--- third_party/libwebrtc/rtc_base/system/rtc_export_gn/moz.build
+++ third_party/libwebrtc/rtc_base/system/rtc_export_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("rtc_export_gn")
diff --git third_party/libwebrtc/rtc_base/system/system_time_gn/moz.build third_party/libwebrtc/rtc_base/system/system_time_gn/moz.build
index e35b5653c932..7c19ff3f4e3c 100644
--- third_party/libwebrtc/rtc_base/system/system_time_gn/moz.build
+++ third_party/libwebrtc/rtc_base/system/system_time_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,93 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("system_time_gn")
diff --git third_party/libwebrtc/rtc_base/system/unused_gn/moz.build third_party/libwebrtc/rtc_base/system/unused_gn/moz.build
index f3bfa058b8da..dbb27540bb55 100644
--- third_party/libwebrtc/rtc_base/system/unused_gn/moz.build
+++ third_party/libwebrtc/rtc_base/system/unused_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("unused_gn")
diff --git third_party/libwebrtc/rtc_base/system/warn_current_thread_is_deadlocked_gn/moz.build third_party/libwebrtc/rtc_base/system/warn_current_thread_is_deadlocked_gn/moz.build
index 1776f4810097..61a096b27143 100644
--- third_party/libwebrtc/rtc_base/system/warn_current_thread_is_deadlocked_gn/moz.build
+++ third_party/libwebrtc/rtc_base/system/warn_current_thread_is_deadlocked_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("warn_current_thread_is_deadlocked_gn")
diff --git third_party/libwebrtc/rtc_base/task_utils/repeating_task_gn/moz.build third_party/libwebrtc/rtc_base/task_utils/repeating_task_gn/moz.build
index ea9014343f0f..a7fca75538e5 100644
--- third_party/libwebrtc/rtc_base/task_utils/repeating_task_gn/moz.build
+++ third_party/libwebrtc/rtc_base/task_utils/repeating_task_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("repeating_task_gn")
diff --git third_party/libwebrtc/rtc_base/threading_gn/moz.build third_party/libwebrtc/rtc_base/threading_gn/moz.build
index cd2aa4c848bb..ec17820b5314 100644
--- third_party/libwebrtc/rtc_base/threading_gn/moz.build
+++ third_party/libwebrtc/rtc_base/threading_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -51,114 +60,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "GLESv2",
-        "log"
-    ]
-
-    UNIFIED_SOURCES += [
-        "/third_party/libwebrtc/rtc_base/physical_socket_server.cc"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-    UNIFIED_SOURCES += [
-        "/third_party/libwebrtc/rtc_base/physical_socket_server.cc"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    UNIFIED_SOURCES += [
-        "/third_party/libwebrtc/rtc_base/physical_socket_server.cc"
-    ]
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
-
-    UNIFIED_SOURCES += [
-        "/third_party/libwebrtc/rtc_base/physical_socket_server.cc"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -166,82 +68,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("threading_gn")
diff --git third_party/libwebrtc/rtc_base/timeutils_gn/moz.build third_party/libwebrtc/rtc_base/timeutils_gn/moz.build
index 043843ae24a3..e105a373a87b 100644
--- third_party/libwebrtc/rtc_base/timeutils_gn/moz.build
+++ third_party/libwebrtc/rtc_base/timeutils_gn/moz.build
@@ -13,6 +13,9 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
@@ -20,8 +23,14 @@ DEFINES["WEBRTC_EXCLUDE_SYSTEM_TIME"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -50,93 +59,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -144,82 +67,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("timeutils_gn")
diff --git third_party/libwebrtc/rtc_base/type_traits_gn/moz.build third_party/libwebrtc/rtc_base/type_traits_gn/moz.build
index 78c723440fb3..535ed340a542 100644
--- third_party/libwebrtc/rtc_base/type_traits_gn/moz.build
+++ third_party/libwebrtc/rtc_base/type_traits_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("type_traits_gn")
diff --git third_party/libwebrtc/rtc_base/units/unit_base_gn/moz.build third_party/libwebrtc/rtc_base/units/unit_base_gn/moz.build
index 758e12d86ea8..8337b99ff9e5 100644
--- third_party/libwebrtc/rtc_base/units/unit_base_gn/moz.build
+++ third_party/libwebrtc/rtc_base/units/unit_base_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,86 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -159,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("unit_base_gn")
diff --git third_party/libwebrtc/rtc_base/untyped_function_gn/moz.build third_party/libwebrtc/rtc_base/untyped_function_gn/moz.build
index 1a9e95bd0b73..5c77c6c91bcf 100644
--- third_party/libwebrtc/rtc_base/untyped_function_gn/moz.build
+++ third_party/libwebrtc/rtc_base/untyped_function_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("untyped_function_gn")
diff --git third_party/libwebrtc/rtc_base/weak_ptr_gn/moz.build third_party/libwebrtc/rtc_base/weak_ptr_gn/moz.build
index 2cfc89818a0e..4028f9570290 100644
--- third_party/libwebrtc/rtc_base/weak_ptr_gn/moz.build
+++ third_party/libwebrtc/rtc_base/weak_ptr_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("weak_ptr_gn")
diff --git third_party/libwebrtc/rtc_base/win/create_direct3d_device_gn/moz.build third_party/libwebrtc/rtc_base/win/create_direct3d_device_gn/moz.build
deleted file mode 100644
index e8a618466231..000000000000
--- third_party/libwebrtc/rtc_base/win/create_direct3d_device_gn/moz.build
+++ /dev/null
@@ -1,93 +0,0 @@
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-
-  ### This moz.build was AUTOMATICALLY GENERATED from a GN config,  ###
-  ### DO NOT edit it by hand.                                       ###
-
-COMPILE_FLAGS["OS_INCLUDES"] = []
-AllowCompilerWarnings()
-
-DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
-DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-DEFINES["NOMINMAX"] = True
-DEFINES["NTDDI_VERSION"] = "0x0A000000"
-DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
-DEFINES["PSAPI_VERSION"] = "2"
-DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
-DEFINES["RTC_ENABLE_VP9"] = True
-DEFINES["RTC_ENABLE_WIN_WGC"] = True
-DEFINES["UNICODE"] = True
-DEFINES["USE_AURA"] = "1"
-DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
-DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
-DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
-DEFINES["WEBRTC_LIBRARY_IMPL"] = True
-DEFINES["WEBRTC_MOZILLA_BUILD"] = True
-DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
-DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
-DEFINES["WEBRTC_WIN"] = True
-DEFINES["WEBRTC_WITHOUT_RUST"] = True
-DEFINES["WIN32"] = True
-DEFINES["WIN32_LEAN_AND_MEAN"] = True
-DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-DEFINES["WINVER"] = "0x0A00"
-DEFINES["_ATL_NO_OPENGL"] = True
-DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-DEFINES["_CRT_RAND_S"] = True
-DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-DEFINES["_HAS_EXCEPTIONS"] = "0"
-DEFINES["_HAS_NODISCARD"] = True
-DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-DEFINES["_SECURE_ATL"] = True
-DEFINES["_UNICODE"] = True
-DEFINES["_WIN32_WINNT"] = "0x0A00"
-DEFINES["_WINDOWS"] = True
-DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-DEFINES["__STD_C"] = True
-
-FINAL_LIBRARY = "xul"
-
-
-LOCAL_INCLUDES += [
-    "!/dist/include/libwebrtc_overrides",
-    "!/ipc/ipdl/_ipdlheaders",
-    "!/third_party/libwebrtc/gen",
-    "/ipc/chromium/src",
-    "/third_party/abseil-cpp/",
-    "/third_party/libwebrtc/",
-    "/tools/profiler/public"
-]
-
-UNIFIED_SOURCES += [
-    "/third_party/libwebrtc/rtc_base/win/create_direct3d_device.cc"
-]
-
-if not CONFIG["MOZ_DEBUG"]:
-
-    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "0"
-    DEFINES["NDEBUG"] = True
-    DEFINES["NVALGRIND"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1":
-
-    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["WEBRTC_ARCH_ARM64"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-    DEFINES["__ARM_NEON__"] = "1"
-
-if CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-Library("create_direct3d_device_gn")
diff --git third_party/libwebrtc/rtc_base/win/get_activation_factory_gn/moz.build third_party/libwebrtc/rtc_base/win/get_activation_factory_gn/moz.build
deleted file mode 100644
index 890cf9872c14..000000000000
--- third_party/libwebrtc/rtc_base/win/get_activation_factory_gn/moz.build
+++ /dev/null
@@ -1,93 +0,0 @@
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-
-  ### This moz.build was AUTOMATICALLY GENERATED from a GN config,  ###
-  ### DO NOT edit it by hand.                                       ###
-
-COMPILE_FLAGS["OS_INCLUDES"] = []
-AllowCompilerWarnings()
-
-DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
-DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-DEFINES["NOMINMAX"] = True
-DEFINES["NTDDI_VERSION"] = "0x0A000000"
-DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
-DEFINES["PSAPI_VERSION"] = "2"
-DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
-DEFINES["RTC_ENABLE_VP9"] = True
-DEFINES["RTC_ENABLE_WIN_WGC"] = True
-DEFINES["UNICODE"] = True
-DEFINES["USE_AURA"] = "1"
-DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
-DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
-DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
-DEFINES["WEBRTC_LIBRARY_IMPL"] = True
-DEFINES["WEBRTC_MOZILLA_BUILD"] = True
-DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
-DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
-DEFINES["WEBRTC_WIN"] = True
-DEFINES["WEBRTC_WITHOUT_RUST"] = True
-DEFINES["WIN32"] = True
-DEFINES["WIN32_LEAN_AND_MEAN"] = True
-DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-DEFINES["WINVER"] = "0x0A00"
-DEFINES["_ATL_NO_OPENGL"] = True
-DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-DEFINES["_CRT_RAND_S"] = True
-DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-DEFINES["_HAS_EXCEPTIONS"] = "0"
-DEFINES["_HAS_NODISCARD"] = True
-DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-DEFINES["_SECURE_ATL"] = True
-DEFINES["_UNICODE"] = True
-DEFINES["_WIN32_WINNT"] = "0x0A00"
-DEFINES["_WINDOWS"] = True
-DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-DEFINES["__STD_C"] = True
-
-FINAL_LIBRARY = "xul"
-
-
-LOCAL_INCLUDES += [
-    "!/dist/include/libwebrtc_overrides",
-    "!/ipc/ipdl/_ipdlheaders",
-    "!/third_party/libwebrtc/gen",
-    "/ipc/chromium/src",
-    "/third_party/abseil-cpp/",
-    "/third_party/libwebrtc/",
-    "/tools/profiler/public"
-]
-
-UNIFIED_SOURCES += [
-    "/third_party/libwebrtc/rtc_base/win/get_activation_factory.cc"
-]
-
-if not CONFIG["MOZ_DEBUG"]:
-
-    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "0"
-    DEFINES["NDEBUG"] = True
-    DEFINES["NVALGRIND"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1":
-
-    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["WEBRTC_ARCH_ARM64"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-    DEFINES["__ARM_NEON__"] = "1"
-
-if CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-Library("get_activation_factory_gn")
diff --git third_party/libwebrtc/rtc_base/win/hstring_gn/moz.build third_party/libwebrtc/rtc_base/win/hstring_gn/moz.build
deleted file mode 100644
index 0b8d1c76da6e..000000000000
--- third_party/libwebrtc/rtc_base/win/hstring_gn/moz.build
+++ /dev/null
@@ -1,93 +0,0 @@
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-
-  ### This moz.build was AUTOMATICALLY GENERATED from a GN config,  ###
-  ### DO NOT edit it by hand.                                       ###
-
-COMPILE_FLAGS["OS_INCLUDES"] = []
-AllowCompilerWarnings()
-
-DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
-DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-DEFINES["NOMINMAX"] = True
-DEFINES["NTDDI_VERSION"] = "0x0A000000"
-DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
-DEFINES["PSAPI_VERSION"] = "2"
-DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
-DEFINES["RTC_ENABLE_VP9"] = True
-DEFINES["RTC_ENABLE_WIN_WGC"] = True
-DEFINES["UNICODE"] = True
-DEFINES["USE_AURA"] = "1"
-DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
-DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
-DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
-DEFINES["WEBRTC_LIBRARY_IMPL"] = True
-DEFINES["WEBRTC_MOZILLA_BUILD"] = True
-DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
-DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
-DEFINES["WEBRTC_WIN"] = True
-DEFINES["WEBRTC_WITHOUT_RUST"] = True
-DEFINES["WIN32"] = True
-DEFINES["WIN32_LEAN_AND_MEAN"] = True
-DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-DEFINES["WINVER"] = "0x0A00"
-DEFINES["_ATL_NO_OPENGL"] = True
-DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-DEFINES["_CRT_RAND_S"] = True
-DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-DEFINES["_HAS_EXCEPTIONS"] = "0"
-DEFINES["_HAS_NODISCARD"] = True
-DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-DEFINES["_SECURE_ATL"] = True
-DEFINES["_UNICODE"] = True
-DEFINES["_WIN32_WINNT"] = "0x0A00"
-DEFINES["_WINDOWS"] = True
-DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-DEFINES["__STD_C"] = True
-
-FINAL_LIBRARY = "xul"
-
-
-LOCAL_INCLUDES += [
-    "!/dist/include/libwebrtc_overrides",
-    "!/ipc/ipdl/_ipdlheaders",
-    "!/third_party/libwebrtc/gen",
-    "/ipc/chromium/src",
-    "/third_party/abseil-cpp/",
-    "/third_party/libwebrtc/",
-    "/tools/profiler/public"
-]
-
-SOURCES += [
-    "/third_party/libwebrtc/rtc_base/win/hstring.cc"
-]
-
-if not CONFIG["MOZ_DEBUG"]:
-
-    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "0"
-    DEFINES["NDEBUG"] = True
-    DEFINES["NVALGRIND"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1":
-
-    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["WEBRTC_ARCH_ARM64"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-    DEFINES["__ARM_NEON__"] = "1"
-
-if CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-Library("hstring_gn")
diff --git third_party/libwebrtc/rtc_base/win/windows_version_gn/moz.build third_party/libwebrtc/rtc_base/win/windows_version_gn/moz.build
deleted file mode 100644
index 9a75dbb6c636..000000000000
--- third_party/libwebrtc/rtc_base/win/windows_version_gn/moz.build
+++ /dev/null
@@ -1,93 +0,0 @@
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-
-  ### This moz.build was AUTOMATICALLY GENERATED from a GN config,  ###
-  ### DO NOT edit it by hand.                                       ###
-
-COMPILE_FLAGS["OS_INCLUDES"] = []
-AllowCompilerWarnings()
-
-DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
-DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-DEFINES["NOMINMAX"] = True
-DEFINES["NTDDI_VERSION"] = "0x0A000000"
-DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
-DEFINES["PSAPI_VERSION"] = "2"
-DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
-DEFINES["RTC_ENABLE_VP9"] = True
-DEFINES["RTC_ENABLE_WIN_WGC"] = True
-DEFINES["UNICODE"] = True
-DEFINES["USE_AURA"] = "1"
-DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
-DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
-DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
-DEFINES["WEBRTC_LIBRARY_IMPL"] = True
-DEFINES["WEBRTC_MOZILLA_BUILD"] = True
-DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
-DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
-DEFINES["WEBRTC_WIN"] = True
-DEFINES["WEBRTC_WITHOUT_RUST"] = True
-DEFINES["WIN32"] = True
-DEFINES["WIN32_LEAN_AND_MEAN"] = True
-DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-DEFINES["WINVER"] = "0x0A00"
-DEFINES["_ATL_NO_OPENGL"] = True
-DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-DEFINES["_CRT_RAND_S"] = True
-DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-DEFINES["_HAS_EXCEPTIONS"] = "0"
-DEFINES["_HAS_NODISCARD"] = True
-DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-DEFINES["_SECURE_ATL"] = True
-DEFINES["_UNICODE"] = True
-DEFINES["_WIN32_WINNT"] = "0x0A00"
-DEFINES["_WINDOWS"] = True
-DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-DEFINES["__STD_C"] = True
-
-FINAL_LIBRARY = "xul"
-
-
-LOCAL_INCLUDES += [
-    "!/dist/include/libwebrtc_overrides",
-    "!/ipc/ipdl/_ipdlheaders",
-    "!/third_party/libwebrtc/gen",
-    "/ipc/chromium/src",
-    "/third_party/abseil-cpp/",
-    "/third_party/libwebrtc/",
-    "/tools/profiler/public"
-]
-
-UNIFIED_SOURCES += [
-    "/third_party/libwebrtc/rtc_base/win/windows_version.cc"
-]
-
-if not CONFIG["MOZ_DEBUG"]:
-
-    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "0"
-    DEFINES["NDEBUG"] = True
-    DEFINES["NVALGRIND"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1":
-
-    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["WEBRTC_ARCH_ARM64"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-    DEFINES["__ARM_NEON__"] = "1"
-
-if CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-Library("windows_version_gn")
diff --git third_party/libwebrtc/rtc_base/win32_gn/moz.build third_party/libwebrtc/rtc_base/win32_gn/moz.build
deleted file mode 100644
index b2123e299400..000000000000
--- third_party/libwebrtc/rtc_base/win32_gn/moz.build
+++ /dev/null
@@ -1,100 +0,0 @@
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-
-  ### This moz.build was AUTOMATICALLY GENERATED from a GN config,  ###
-  ### DO NOT edit it by hand.                                       ###
-
-COMPILE_FLAGS["OS_INCLUDES"] = []
-AllowCompilerWarnings()
-
-DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
-DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-DEFINES["NOMINMAX"] = True
-DEFINES["NTDDI_VERSION"] = "0x0A000000"
-DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
-DEFINES["PSAPI_VERSION"] = "2"
-DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
-DEFINES["RTC_ENABLE_VP9"] = True
-DEFINES["RTC_ENABLE_WIN_WGC"] = True
-DEFINES["UNICODE"] = True
-DEFINES["USE_AURA"] = "1"
-DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
-DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
-DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
-DEFINES["WEBRTC_LIBRARY_IMPL"] = True
-DEFINES["WEBRTC_MOZILLA_BUILD"] = True
-DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
-DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
-DEFINES["WEBRTC_WIN"] = True
-DEFINES["WEBRTC_WITHOUT_RUST"] = True
-DEFINES["WIN32"] = True
-DEFINES["WIN32_LEAN_AND_MEAN"] = True
-DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-DEFINES["WINVER"] = "0x0A00"
-DEFINES["_ATL_NO_OPENGL"] = True
-DEFINES["_CRT_NONSTDC_NO_DEPRECATE"] = True
-DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-DEFINES["_CRT_RAND_S"] = True
-DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-DEFINES["_HAS_EXCEPTIONS"] = "0"
-DEFINES["_HAS_NODISCARD"] = True
-DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-DEFINES["_SECURE_ATL"] = True
-DEFINES["_UNICODE"] = True
-DEFINES["_WIN32_WINNT"] = "0x0A00"
-DEFINES["_WINDOWS"] = True
-DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-DEFINES["__STD_C"] = True
-
-FINAL_LIBRARY = "xul"
-
-
-LOCAL_INCLUDES += [
-    "!/dist/include/libwebrtc_overrides",
-    "!/ipc/ipdl/_ipdlheaders",
-    "!/third_party/libwebrtc/gen",
-    "/ipc/chromium/src",
-    "/third_party/abseil-cpp/",
-    "/third_party/libwebrtc/",
-    "/tools/profiler/public"
-]
-
-OS_LIBS += [
-    "crypt32",
-    "iphlpapi",
-    "secur32"
-]
-
-UNIFIED_SOURCES += [
-    "/third_party/libwebrtc/rtc_base/win32.cc"
-]
-
-if not CONFIG["MOZ_DEBUG"]:
-
-    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "0"
-    DEFINES["NDEBUG"] = True
-    DEFINES["NVALGRIND"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1":
-
-    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["WEBRTC_ARCH_ARM64"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-    DEFINES["__ARM_NEON__"] = "1"
-
-if CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-Library("win32_gn")
diff --git third_party/libwebrtc/rtc_base/windowed_min_filter_gn/moz.build third_party/libwebrtc/rtc_base/windowed_min_filter_gn/moz.build
index 06195882208b..d11031074c94 100644
--- third_party/libwebrtc/rtc_base/windowed_min_filter_gn/moz.build
+++ third_party/libwebrtc/rtc_base/windowed_min_filter_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,86 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -159,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("windowed_min_filter_gn")
diff --git third_party/libwebrtc/rtc_base/zero_memory_gn/moz.build third_party/libwebrtc/rtc_base/zero_memory_gn/moz.build
index d7a5e748e200..a5ffb5cb47e2 100644
--- third_party/libwebrtc/rtc_base/zero_memory_gn/moz.build
+++ third_party/libwebrtc/rtc_base/zero_memory_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("zero_memory_gn")
diff --git third_party/libwebrtc/sdk/base_objc_gn/moz.build third_party/libwebrtc/sdk/base_objc_gn/moz.build
deleted file mode 100644
index 9a8fa91148c0..000000000000
--- third_party/libwebrtc/sdk/base_objc_gn/moz.build
+++ /dev/null
@@ -1,89 +0,0 @@
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-
-  ### This moz.build was AUTOMATICALLY GENERATED from a GN config,  ###
-  ### DO NOT edit it by hand.                                       ###
-
-CMFLAGS += [
-    "-fobjc-arc"
-]
-
-CMMFLAGS += [
-    "-fobjc-arc"
-]
-
-COMPILE_FLAGS["OS_INCLUDES"] = []
-AllowCompilerWarnings()
-
-DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
-DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
-DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
-DEFINES["RTC_ENABLE_VP9"] = True
-DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
-DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
-DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
-DEFINES["WEBRTC_LIBRARY_IMPL"] = True
-DEFINES["WEBRTC_MAC"] = True
-DEFINES["WEBRTC_MOZILLA_BUILD"] = True
-DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
-DEFINES["WEBRTC_POSIX"] = True
-DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
-DEFINES["WEBRTC_WITHOUT_RUST"] = True
-DEFINES["__STDC_CONSTANT_MACROS"] = True
-DEFINES["__STDC_FORMAT_MACROS"] = True
-
-FINAL_LIBRARY = "xul"
-
-
-LOCAL_INCLUDES += [
-    "!/dist/include/libwebrtc_overrides",
-    "!/ipc/ipdl/_ipdlheaders",
-    "!/third_party/libwebrtc/gen",
-    "/ipc/chromium/src",
-    "/third_party/abseil-cpp/",
-    "/third_party/libwebrtc/",
-    "/third_party/libwebrtc/sdk/objc/",
-    "/third_party/libwebrtc/sdk/objc/base/",
-    "/tools/profiler/public"
-]
-
-OS_LIBS += [
-    "-framework AVFoundation",
-    "-framework Foundation"
-]
-
-UNIFIED_SOURCES += [
-    "/third_party/libwebrtc/sdk/objc/base/RTCEncodedImage.m",
-    "/third_party/libwebrtc/sdk/objc/base/RTCLogging.mm",
-    "/third_party/libwebrtc/sdk/objc/base/RTCVideoCapturer.m",
-    "/third_party/libwebrtc/sdk/objc/base/RTCVideoCodecInfo.m",
-    "/third_party/libwebrtc/sdk/objc/base/RTCVideoEncoderFactory.mm",
-    "/third_party/libwebrtc/sdk/objc/base/RTCVideoEncoderQpThresholds.m",
-    "/third_party/libwebrtc/sdk/objc/base/RTCVideoEncoderSettings.m",
-    "/third_party/libwebrtc/sdk/objc/base/RTCVideoFrame.mm"
-]
-
-if not CONFIG["MOZ_DEBUG"]:
-
-    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "0"
-    DEFINES["NDEBUG"] = True
-    DEFINES["NVALGRIND"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1":
-
-    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["WEBRTC_ARCH_ARM64"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-    DEFINES["__ARM_NEON__"] = "1"
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-Library("base_objc_gn")
diff --git third_party/libwebrtc/sdk/helpers_objc_gn/moz.build third_party/libwebrtc/sdk/helpers_objc_gn/moz.build
deleted file mode 100644
index f59b0853c5ae..000000000000
--- third_party/libwebrtc/sdk/helpers_objc_gn/moz.build
+++ /dev/null
@@ -1,85 +0,0 @@
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-
-  ### This moz.build was AUTOMATICALLY GENERATED from a GN config,  ###
-  ### DO NOT edit it by hand.                                       ###
-
-CMFLAGS += [
-    "-fobjc-arc"
-]
-
-CMMFLAGS += [
-    "-fobjc-arc"
-]
-
-COMPILE_FLAGS["OS_INCLUDES"] = []
-AllowCompilerWarnings()
-
-DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
-DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
-DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
-DEFINES["RTC_ENABLE_VP9"] = True
-DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
-DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
-DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
-DEFINES["WEBRTC_LIBRARY_IMPL"] = True
-DEFINES["WEBRTC_MAC"] = True
-DEFINES["WEBRTC_MOZILLA_BUILD"] = True
-DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
-DEFINES["WEBRTC_POSIX"] = True
-DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
-DEFINES["WEBRTC_WITHOUT_RUST"] = True
-DEFINES["__STDC_CONSTANT_MACROS"] = True
-DEFINES["__STDC_FORMAT_MACROS"] = True
-
-FINAL_LIBRARY = "xul"
-
-
-LOCAL_INCLUDES += [
-    "!/dist/include/libwebrtc_overrides",
-    "!/ipc/ipdl/_ipdlheaders",
-    "!/third_party/libwebrtc/gen",
-    "/ipc/chromium/src",
-    "/third_party/abseil-cpp/",
-    "/third_party/libwebrtc/",
-    "/third_party/libwebrtc/sdk/objc/",
-    "/third_party/libwebrtc/sdk/objc/base/",
-    "/tools/profiler/public"
-]
-
-OS_LIBS += [
-    "-framework AVFoundation",
-    "-framework CoreMedia",
-    "-framework Foundation"
-]
-
-UNIFIED_SOURCES += [
-    "/third_party/libwebrtc/sdk/objc/helpers/AVCaptureSession+DevicePosition.mm",
-    "/third_party/libwebrtc/sdk/objc/helpers/NSString+StdString.mm",
-    "/third_party/libwebrtc/sdk/objc/helpers/RTCDispatcher.m"
-]
-
-if not CONFIG["MOZ_DEBUG"]:
-
-    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "0"
-    DEFINES["NDEBUG"] = True
-    DEFINES["NVALGRIND"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1":
-
-    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["WEBRTC_ARCH_ARM64"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-    DEFINES["__ARM_NEON__"] = "1"
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-Library("helpers_objc_gn")
diff --git third_party/libwebrtc/sdk/videocapture_objc_gn/moz.build third_party/libwebrtc/sdk/videocapture_objc_gn/moz.build
deleted file mode 100644
index 5b07a7907500..000000000000
--- third_party/libwebrtc/sdk/videocapture_objc_gn/moz.build
+++ /dev/null
@@ -1,84 +0,0 @@
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-
-  ### This moz.build was AUTOMATICALLY GENERATED from a GN config,  ###
-  ### DO NOT edit it by hand.                                       ###
-
-CMFLAGS += [
-    "-fobjc-arc"
-]
-
-COMPILE_FLAGS["OS_INCLUDES"] = []
-AllowCompilerWarnings()
-
-DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
-DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
-DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
-DEFINES["RTC_ENABLE_VP9"] = True
-DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
-DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
-DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
-DEFINES["WEBRTC_LIBRARY_IMPL"] = True
-DEFINES["WEBRTC_MAC"] = True
-DEFINES["WEBRTC_MOZILLA_BUILD"] = True
-DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
-DEFINES["WEBRTC_POSIX"] = True
-DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
-DEFINES["WEBRTC_WITHOUT_RUST"] = True
-DEFINES["__STDC_CONSTANT_MACROS"] = True
-DEFINES["__STDC_FORMAT_MACROS"] = True
-
-FINAL_LIBRARY = "xul"
-
-
-LOCAL_INCLUDES += [
-    "!/dist/include/libwebrtc_overrides",
-    "!/ipc/ipdl/_ipdlheaders",
-    "!/third_party/libwebrtc/gen",
-    "/ipc/chromium/src",
-    "/third_party/abseil-cpp/",
-    "/third_party/libwebrtc/",
-    "/third_party/libwebrtc/sdk/objc/",
-    "/third_party/libwebrtc/sdk/objc/base/",
-    "/tools/profiler/public"
-]
-
-OS_LIBS += [
-    "-framework AVFoundation",
-    "-framework CoreGraphics",
-    "-framework CoreMedia",
-    "-framework CoreVideo",
-    "-framework Foundation",
-    "-framework QuartzCore",
-    "-framework VideoToolbox"
-]
-
-UNIFIED_SOURCES += [
-    "/third_party/libwebrtc/sdk/objc/components/capturer/RTCCameraVideoCapturer.m",
-    "/third_party/libwebrtc/sdk/objc/components/capturer/RTCFileVideoCapturer.m"
-]
-
-if not CONFIG["MOZ_DEBUG"]:
-
-    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "0"
-    DEFINES["NDEBUG"] = True
-    DEFINES["NVALGRIND"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1":
-
-    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["WEBRTC_ARCH_ARM64"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-    DEFINES["__ARM_NEON__"] = "1"
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-Library("videocapture_objc_gn")
diff --git third_party/libwebrtc/sdk/videoframebuffer_objc_gn/moz.build third_party/libwebrtc/sdk/videoframebuffer_objc_gn/moz.build
deleted file mode 100644
index c89ab03fc172..000000000000
--- third_party/libwebrtc/sdk/videoframebuffer_objc_gn/moz.build
+++ /dev/null
@@ -1,85 +0,0 @@
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-
-  ### This moz.build was AUTOMATICALLY GENERATED from a GN config,  ###
-  ### DO NOT edit it by hand.                                       ###
-
-CMMFLAGS += [
-    "-fobjc-arc"
-]
-
-COMPILE_FLAGS["OS_INCLUDES"] = []
-AllowCompilerWarnings()
-
-DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
-DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
-DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
-DEFINES["RTC_ENABLE_VP9"] = True
-DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
-DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
-DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
-DEFINES["WEBRTC_LIBRARY_IMPL"] = True
-DEFINES["WEBRTC_MAC"] = True
-DEFINES["WEBRTC_MOZILLA_BUILD"] = True
-DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
-DEFINES["WEBRTC_POSIX"] = True
-DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
-DEFINES["WEBRTC_WITHOUT_RUST"] = True
-DEFINES["__STDC_CONSTANT_MACROS"] = True
-DEFINES["__STDC_FORMAT_MACROS"] = True
-
-FINAL_LIBRARY = "xul"
-
-
-LOCAL_INCLUDES += [
-    "!/dist/include/libwebrtc_overrides",
-    "!/ipc/ipdl/_ipdlheaders",
-    "!/third_party/libwebrtc/gen",
-    "/ipc/chromium/src",
-    "/media/libyuv/",
-    "/media/libyuv/libyuv/include/",
-    "/third_party/abseil-cpp/",
-    "/third_party/libwebrtc/",
-    "/third_party/libwebrtc/sdk/objc/",
-    "/third_party/libwebrtc/sdk/objc/base/",
-    "/tools/profiler/public"
-]
-
-OS_LIBS += [
-    "-framework AVFoundation",
-    "-framework CoreGraphics",
-    "-framework CoreVideo",
-    "-framework Foundation",
-    "-framework VideoToolbox"
-]
-
-UNIFIED_SOURCES += [
-    "/third_party/libwebrtc/sdk/objc/api/video_frame_buffer/RTCNativeI420Buffer.mm",
-    "/third_party/libwebrtc/sdk/objc/api/video_frame_buffer/RTCNativeMutableI420Buffer.mm",
-    "/third_party/libwebrtc/sdk/objc/components/video_frame_buffer/RTCCVPixelBuffer.mm"
-]
-
-if not CONFIG["MOZ_DEBUG"]:
-
-    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "0"
-    DEFINES["NDEBUG"] = True
-    DEFINES["NVALGRIND"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1":
-
-    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["WEBRTC_ARCH_ARM64"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-    DEFINES["__ARM_NEON__"] = "1"
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-Library("videoframebuffer_objc_gn")
diff --git third_party/libwebrtc/system_wrappers/metrics_gn/moz.build third_party/libwebrtc/system_wrappers/metrics_gn/moz.build
index 117865292c13..4f73cb41181a 100644
--- third_party/libwebrtc/system_wrappers/metrics_gn/moz.build
+++ third_party/libwebrtc/system_wrappers/metrics_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("metrics_gn")
diff --git third_party/libwebrtc/system_wrappers/system_wrappers_gn/moz.build third_party/libwebrtc/system_wrappers/system_wrappers_gn/moz.build
index c30ba47148a7..1230c8c08666 100644
--- third_party/libwebrtc/system_wrappers/system_wrappers_gn/moz.build
+++ third_party/libwebrtc/system_wrappers/system_wrappers_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("system_wrappers_gn")
diff --git third_party/libwebrtc/test/rtp_test_utils_gn/moz.build third_party/libwebrtc/test/rtp_test_utils_gn/moz.build
index 752bb45454df..c732452c16c1 100644
--- third_party/libwebrtc/test/rtp_test_utils_gn/moz.build
+++ third_party/libwebrtc/test/rtp_test_utils_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,97 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -170,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("rtp_test_utils_gn")
diff --git third_party/libwebrtc/third_party/cpu_features/ndk_compat_gn/moz.build third_party/libwebrtc/third_party/cpu_features/ndk_compat_gn/moz.build
deleted file mode 100644
index b7d9cb6142bd..000000000000
--- third_party/libwebrtc/third_party/cpu_features/ndk_compat_gn/moz.build
+++ /dev/null
@@ -1,47 +0,0 @@
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-
-  ### This moz.build was AUTOMATICALLY GENERATED from a GN config,  ###
-  ### DO NOT edit it by hand.                                       ###
-
-COMPILE_FLAGS["OS_INCLUDES"] = []
-AllowCompilerWarnings()
-
-DEFINES["ANDROID"] = True
-DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-DEFINES["HAVE_SYS_UIO_H"] = True
-DEFINES["_GNU_SOURCE"] = True
-DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-DEFINES["__STDC_CONSTANT_MACROS"] = True
-DEFINES["__STDC_FORMAT_MACROS"] = True
-
-FINAL_LIBRARY = "xul"
-
-
-LOCAL_INCLUDES += [
-    "!/dist/include/libwebrtc_overrides",
-    "!/ipc/ipdl/_ipdlheaders",
-    "!/third_party/libwebrtc/gen",
-    "/ipc/chromium/src",
-    "/third_party/libwebrtc/",
-    "/tools/profiler/public"
-]
-
-if not CONFIG["MOZ_DEBUG"]:
-
-    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "0"
-    DEFINES["NDEBUG"] = True
-    DEFINES["NVALGRIND"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1":
-
-    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["__ARM_NEON__"] = "1"
-
-Library("ndk_compat_gn")
diff --git third_party/libwebrtc/third_party/dav1d/dav1d_gn/moz.build third_party/libwebrtc/third_party/dav1d/dav1d_gn/moz.build
index 3469fef9714a..5b4ff22eae3c 100644
--- third_party/libwebrtc/third_party/dav1d/dav1d_gn/moz.build
+++ third_party/libwebrtc/third_party/dav1d/dav1d_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -46,82 +55,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -129,25 +63,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -157,40 +76,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("dav1d_gn")
diff --git third_party/libwebrtc/third_party/libaom/libaom_gn/moz.build third_party/libwebrtc/third_party/libaom/libaom_gn/moz.build
index 5214cbb7c05c..840fd6edf42b 100644
--- third_party/libwebrtc/third_party/libaom/libaom_gn/moz.build
+++ third_party/libwebrtc/third_party/libaom/libaom_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,82 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -127,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -155,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("aom_gn")
diff --git third_party/libwebrtc/third_party/libepoxy/libepoxy_gn/moz.build third_party/libwebrtc/third_party/libepoxy/libepoxy_gn/moz.build
index b5f2d069737c..000eebb96583 100644
--- third_party/libwebrtc/third_party/libepoxy/libepoxy_gn/moz.build
+++ third_party/libwebrtc/third_party/libepoxy/libepoxy_gn/moz.build
@@ -13,22 +13,19 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
-DEFINES["USE_AURA"] = "1"
 DEFINES["USE_GLIB"] = "1"
 DEFINES["USE_OZONE"] = "1"
-DEFINES["USE_UDEV"] = True
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
-DEFINES["WEBRTC_LINUX"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
 DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
 DEFINES["_FILE_OFFSET_BITS"] = "64"
-DEFINES["_GNU_SOURCE"] = True
 DEFINES["_LARGEFILE64_SOURCE"] = True
 DEFINES["_LARGEFILE_SOURCE"] = True
 DEFINES["__STDC_CONSTANT_MACROS"] = True
@@ -66,12 +63,6 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
diff --git third_party/libwebrtc/third_party/libyuv/libyuv_gn/moz.build third_party/libwebrtc/third_party/libyuv/libyuv_gn/moz.build
index 36cab9ab9d80..ae486d52ac54 100644
--- third_party/libwebrtc/third_party/libyuv/libyuv_gn/moz.build
+++ third_party/libwebrtc/third_party/libyuv/libyuv_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -46,82 +55,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -129,25 +63,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -157,40 +76,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("yuv_gn")
diff --git third_party/libwebrtc/third_party/opus/opus_gn/moz.build third_party/libwebrtc/third_party/opus/opus_gn/moz.build
index bfeaa56b05af..d8e71c4280d9 100644
--- third_party/libwebrtc/third_party/opus/opus_gn/moz.build
+++ third_party/libwebrtc/third_party/opus/opus_gn/moz.build
@@ -9,6 +9,14 @@
 COMPILE_FLAGS["OS_INCLUDES"] = []
 AllowCompilerWarnings()
 
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
+
 FINAL_LIBRARY = "xul"
 
 
@@ -30,120 +38,10 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips32":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("opus_gn")
diff --git third_party/libwebrtc/third_party/pffft/pffft_gn/moz.build third_party/libwebrtc/third_party/pffft/pffft_gn/moz.build
index fa6a7850dc2f..328baf0e1eac 100644
--- third_party/libwebrtc/third_party/pffft/pffft_gn/moz.build
+++ third_party/libwebrtc/third_party/pffft/pffft_gn/moz.build
@@ -9,6 +9,14 @@
 COMPILE_FLAGS["OS_INCLUDES"] = []
 AllowCompilerWarnings()
 
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
+
 FINAL_LIBRARY = "xul"
 
 
@@ -34,95 +42,23 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_USE_MATH_DEFINES"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CFLAGS += [
-        "-mfpu=neon"
-    ]
-
 if CONFIG["TARGET_CPU"] == "loongarch64":
 
     DEFINES["PFFFT_SIMD_DISABLE"] = True
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["PFFFT_SIMD_DISABLE"] = True
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "mips64":
 
     DEFINES["PFFFT_SIMD_DISABLE"] = True
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "ppc64":
 
@@ -132,50 +68,10 @@ if CONFIG["TARGET_CPU"] == "riscv64":
 
     DEFINES["PFFFT_SIMD_DISABLE"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
-    CFLAGS += [
-        "-msse2"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
+if CONFIG["TARGET_CPU"] == "x86":
 
     CFLAGS += [
         "-msse2"
     ]
 
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("pffft_gn")
diff --git third_party/libwebrtc/third_party/rnnoise/rnn_vad_gn/moz.build third_party/libwebrtc/third_party/rnnoise/rnn_vad_gn/moz.build
index 11dbf4942190..d44acce8cafa 100644
--- third_party/libwebrtc/third_party/rnnoise/rnn_vad_gn/moz.build
+++ third_party/libwebrtc/third_party/rnnoise/rnn_vad_gn/moz.build
@@ -9,6 +9,14 @@
 COMPILE_FLAGS["OS_INCLUDES"] = []
 AllowCompilerWarnings()
 
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
+
 FINAL_LIBRARY = "xul"
 
 
@@ -34,136 +42,16 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips32":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
+if CONFIG["TARGET_CPU"] == "x86":
 
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("rnn_vad_gn")
diff --git third_party/libwebrtc/video/adaptation/video_adaptation_gn/moz.build third_party/libwebrtc/video/adaptation/video_adaptation_gn/moz.build
index 10e4325520b0..2ab921903ce3 100644
--- third_party/libwebrtc/video/adaptation/video_adaptation_gn/moz.build
+++ third_party/libwebrtc/video/adaptation/video_adaptation_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -59,97 +68,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -157,82 +76,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("video_adaptation_gn")
diff --git third_party/libwebrtc/video/config/encoder_config_gn/moz.build third_party/libwebrtc/video/config/encoder_config_gn/moz.build
index 2b3ab9c02417..36d10e979379 100644
--- third_party/libwebrtc/video/config/encoder_config_gn/moz.build
+++ third_party/libwebrtc/video/config/encoder_config_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("encoder_config_gn")
diff --git third_party/libwebrtc/video/config/streams_config_gn/moz.build third_party/libwebrtc/video/config/streams_config_gn/moz.build
index 6e21015327c2..2465550f5e78 100644
--- third_party/libwebrtc/video/config/streams_config_gn/moz.build
+++ third_party/libwebrtc/video/config/streams_config_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -49,97 +58,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -147,82 +66,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("streams_config_gn")
diff --git third_party/libwebrtc/video/corruption_detection/corruption_classifier_gn/moz.build third_party/libwebrtc/video/corruption_detection/corruption_classifier_gn/moz.build
index 97e44333e36d..44c789fff26c 100644
--- third_party/libwebrtc/video/corruption_detection/corruption_classifier_gn/moz.build
+++ third_party/libwebrtc/video/corruption_detection/corruption_classifier_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("corruption_classifier_gn")
diff --git third_party/libwebrtc/video/corruption_detection/frame_instrumentation_generator_impl_gn/moz.build third_party/libwebrtc/video/corruption_detection/frame_instrumentation_generator_impl_gn/moz.build
index db2f64dfd026..497765f6cf79 100644
--- third_party/libwebrtc/video/corruption_detection/frame_instrumentation_generator_impl_gn/moz.build
+++ third_party/libwebrtc/video/corruption_detection/frame_instrumentation_generator_impl_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("frame_instrumentation_generator_impl_gn")
diff --git third_party/libwebrtc/video/corruption_detection/frame_selector_gn/moz.build third_party/libwebrtc/video/corruption_detection/frame_selector_gn/moz.build
index 9bac4318e841..2db78784e441 100644
--- third_party/libwebrtc/video/corruption_detection/frame_selector_gn/moz.build
+++ third_party/libwebrtc/video/corruption_detection/frame_selector_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("frame_selector_gn")
diff --git third_party/libwebrtc/video/corruption_detection/generic_mapping_functions_gn/moz.build third_party/libwebrtc/video/corruption_detection/generic_mapping_functions_gn/moz.build
index e22febc9f9ee..57023479180b 100644
--- third_party/libwebrtc/video/corruption_detection/generic_mapping_functions_gn/moz.build
+++ third_party/libwebrtc/video/corruption_detection/generic_mapping_functions_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("generic_mapping_functions_gn")
diff --git third_party/libwebrtc/video/corruption_detection/halton_frame_sampler_gn/moz.build third_party/libwebrtc/video/corruption_detection/halton_frame_sampler_gn/moz.build
index 2f12260e636a..67c67466075f 100644
--- third_party/libwebrtc/video/corruption_detection/halton_frame_sampler_gn/moz.build
+++ third_party/libwebrtc/video/corruption_detection/halton_frame_sampler_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("halton_frame_sampler_gn")
diff --git third_party/libwebrtc/video/corruption_detection/halton_sequence_gn/moz.build third_party/libwebrtc/video/corruption_detection/halton_sequence_gn/moz.build
index 7fd16ff62e4c..9f68ea2a0d6c 100644
--- third_party/libwebrtc/video/corruption_detection/halton_sequence_gn/moz.build
+++ third_party/libwebrtc/video/corruption_detection/halton_sequence_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("halton_sequence_gn")
diff --git third_party/libwebrtc/video/corruption_detection/utils_gn/moz.build third_party/libwebrtc/video/corruption_detection/utils_gn/moz.build
index daa1f5d1c176..8021885cb154 100644
--- third_party/libwebrtc/video/corruption_detection/utils_gn/moz.build
+++ third_party/libwebrtc/video/corruption_detection/utils_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("utils_gn")
diff --git third_party/libwebrtc/video/corruption_detection/video_frame_sampler_gn/moz.build third_party/libwebrtc/video/corruption_detection/video_frame_sampler_gn/moz.build
index 86210ec25c1b..c82635f0a313 100644
--- third_party/libwebrtc/video/corruption_detection/video_frame_sampler_gn/moz.build
+++ third_party/libwebrtc/video/corruption_detection/video_frame_sampler_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("video_frame_sampler_gn")
diff --git third_party/libwebrtc/video/decode_synchronizer_gn/moz.build third_party/libwebrtc/video/decode_synchronizer_gn/moz.build
index bd919652b2e3..523edf4e391d 100644
--- third_party/libwebrtc/video/decode_synchronizer_gn/moz.build
+++ third_party/libwebrtc/video/decode_synchronizer_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("decode_synchronizer_gn")
diff --git third_party/libwebrtc/video/frame_cadence_adapter_gn/moz.build third_party/libwebrtc/video/frame_cadence_adapter_gn/moz.build
index ee715e8814c0..16de29f3ef47 100644
--- third_party/libwebrtc/video/frame_cadence_adapter_gn/moz.build
+++ third_party/libwebrtc/video/frame_cadence_adapter_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("frame_cadence_adapter_gn")
diff --git third_party/libwebrtc/video/frame_decode_scheduler_gn/moz.build third_party/libwebrtc/video/frame_decode_scheduler_gn/moz.build
index 8f2d277ae8d2..03742ab3a957 100644
--- third_party/libwebrtc/video/frame_decode_scheduler_gn/moz.build
+++ third_party/libwebrtc/video/frame_decode_scheduler_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,97 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -170,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("frame_decode_scheduler_gn")
diff --git third_party/libwebrtc/video/frame_decode_timing_gn/moz.build third_party/libwebrtc/video/frame_decode_timing_gn/moz.build
index d623e4c3e17a..9ed9acfd8c4e 100644
--- third_party/libwebrtc/video/frame_decode_timing_gn/moz.build
+++ third_party/libwebrtc/video/frame_decode_timing_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("frame_decode_timing_gn")
diff --git third_party/libwebrtc/video/frame_dumping_decoder_gn/moz.build third_party/libwebrtc/video/frame_dumping_decoder_gn/moz.build
index 1dda6923bb74..fae188398fc4 100644
--- third_party/libwebrtc/video/frame_dumping_decoder_gn/moz.build
+++ third_party/libwebrtc/video/frame_dumping_decoder_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("frame_dumping_decoder_gn")
diff --git third_party/libwebrtc/video/frame_dumping_encoder_gn/moz.build third_party/libwebrtc/video/frame_dumping_encoder_gn/moz.build
index 9e68dd0b55a6..cfcc91faa49b 100644
--- third_party/libwebrtc/video/frame_dumping_encoder_gn/moz.build
+++ third_party/libwebrtc/video/frame_dumping_encoder_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("frame_dumping_encoder_gn")
diff --git third_party/libwebrtc/video/null_video_decoder_gn/moz.build third_party/libwebrtc/video/null_video_decoder_gn/moz.build
index a292e4f57be9..298a5dd7ddaa 100644
--- third_party/libwebrtc/video/null_video_decoder_gn/moz.build
+++ third_party/libwebrtc/video/null_video_decoder_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("null_video_decoder_gn")
diff --git third_party/libwebrtc/video/render/incoming_video_stream_gn/moz.build third_party/libwebrtc/video/render/incoming_video_stream_gn/moz.build
index ed202f2e494a..9aeb6089a633 100644
--- third_party/libwebrtc/video/render/incoming_video_stream_gn/moz.build
+++ third_party/libwebrtc/video/render/incoming_video_stream_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("incoming_video_stream_gn")
diff --git third_party/libwebrtc/video/render/video_render_frames_gn/moz.build third_party/libwebrtc/video/render/video_render_frames_gn/moz.build
index 19a4e9f14a97..0ecc7f4ffbb9 100644
--- third_party/libwebrtc/video/render/video_render_frames_gn/moz.build
+++ third_party/libwebrtc/video/render/video_render_frames_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("video_render_frames_gn")
diff --git third_party/libwebrtc/video/task_queue_frame_decode_scheduler_gn/moz.build third_party/libwebrtc/video/task_queue_frame_decode_scheduler_gn/moz.build
index ac89f35b65e6..2290891475a5 100644
--- third_party/libwebrtc/video/task_queue_frame_decode_scheduler_gn/moz.build
+++ third_party/libwebrtc/video/task_queue_frame_decode_scheduler_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("task_queue_frame_decode_scheduler_gn")
diff --git third_party/libwebrtc/video/timing/default_video_jitter_timing_gn/moz.build third_party/libwebrtc/video/timing/default_video_jitter_timing_gn/moz.build
index 9bbe7dc5449c..3f2520212d1a 100644
--- third_party/libwebrtc/video/timing/default_video_jitter_timing_gn/moz.build
+++ third_party/libwebrtc/video/timing/default_video_jitter_timing_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("default_video_jitter_timing_gn")
diff --git third_party/libwebrtc/video/timing/frame_delay_variation_kalman_filter_gn/moz.build third_party/libwebrtc/video/timing/frame_delay_variation_kalman_filter_gn/moz.build
index 9359bf2357fd..bab198df00c2 100644
--- third_party/libwebrtc/video/timing/frame_delay_variation_kalman_filter_gn/moz.build
+++ third_party/libwebrtc/video/timing/frame_delay_variation_kalman_filter_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("frame_delay_variation_kalman_filter_gn")
diff --git third_party/libwebrtc/video/timing/inter_frame_delay_variation_calculator_gn/moz.build third_party/libwebrtc/video/timing/inter_frame_delay_variation_calculator_gn/moz.build
index b95f4cf896df..72a746a4f4d9 100644
--- third_party/libwebrtc/video/timing/inter_frame_delay_variation_calculator_gn/moz.build
+++ third_party/libwebrtc/video/timing/inter_frame_delay_variation_calculator_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("inter_frame_delay_variation_calculator_gn")
diff --git third_party/libwebrtc/video/timing/jitter_estimator_gn/moz.build third_party/libwebrtc/video/timing/jitter_estimator_gn/moz.build
index 3e667d39673b..88f436065cbc 100644
--- third_party/libwebrtc/video/timing/jitter_estimator_gn/moz.build
+++ third_party/libwebrtc/video/timing/jitter_estimator_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("jitter_estimator_gn")
diff --git third_party/libwebrtc/video/timing/rtt_filter_gn/moz.build third_party/libwebrtc/video/timing/rtt_filter_gn/moz.build
index c3597bceacc4..c2aea2ca08a2 100644
--- third_party/libwebrtc/video/timing/rtt_filter_gn/moz.build
+++ third_party/libwebrtc/video/timing/rtt_filter_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,86 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -135,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("rtt_filter_gn")
diff --git third_party/libwebrtc/video/timing/timestamp_extrapolator_gn/moz.build third_party/libwebrtc/video/timing/timestamp_extrapolator_gn/moz.build
index 9f6ea381b47c..4a0e56b86158 100644
--- third_party/libwebrtc/video/timing/timestamp_extrapolator_gn/moz.build
+++ third_party/libwebrtc/video/timing/timestamp_extrapolator_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("timestamp_extrapolator_gn")
diff --git third_party/libwebrtc/video/unique_timestamp_counter_gn/moz.build third_party/libwebrtc/video/unique_timestamp_counter_gn/moz.build
index 0358517d1ac8..864f650f8d64 100644
--- third_party/libwebrtc/video/unique_timestamp_counter_gn/moz.build
+++ third_party/libwebrtc/video/unique_timestamp_counter_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,82 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -131,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("unique_timestamp_counter_gn")
diff --git third_party/libwebrtc/video/video_gn/moz.build third_party/libwebrtc/video/video_gn/moz.build
index babb731f3905..22d0232e59dc 100644
--- third_party/libwebrtc/video/video_gn/moz.build
+++ third_party/libwebrtc/video/video_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -67,98 +76,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "GLESv2",
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -166,82 +84,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("video_gn")
diff --git third_party/libwebrtc/video/video_receive_stream_timeout_tracker_gn/moz.build third_party/libwebrtc/video/video_receive_stream_timeout_tracker_gn/moz.build
index e4446588e44d..978ecc6e8079 100644
--- third_party/libwebrtc/video/video_receive_stream_timeout_tracker_gn/moz.build
+++ third_party/libwebrtc/video/video_receive_stream_timeout_tracker_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("video_receive_stream_timeout_tracker_gn")
diff --git third_party/libwebrtc/video/video_stream_buffer_controller_gn/moz.build third_party/libwebrtc/video/video_stream_buffer_controller_gn/moz.build
index d9f4ba456dc0..efe77a5ca4be 100644
--- third_party/libwebrtc/video/video_stream_buffer_controller_gn/moz.build
+++ third_party/libwebrtc/video/video_stream_buffer_controller_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -48,97 +57,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -146,82 +65,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("video_stream_buffer_controller_gn")
diff --git third_party/libwebrtc/video/video_stream_encoder_impl_gn/moz.build third_party/libwebrtc/video/video_stream_encoder_impl_gn/moz.build
index e968e02e0152..d573edea3d17 100644
--- third_party/libwebrtc/video/video_stream_encoder_impl_gn/moz.build
+++ third_party/libwebrtc/video/video_stream_encoder_impl_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -56,98 +65,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "GLESv2",
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -155,82 +73,21 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    CXXFLAGS += [
-        "-mfpu=neon"
-    ]
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["WEBRTC_ENABLE_AVX2"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
-
     CXXFLAGS += [
         "-msse2"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    CXXFLAGS += [
-        "-msse2"
-    ]
-
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+if CONFIG["TARGET_CPU"] == "x86_64":
 
-    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
 Library("video_stream_encoder_impl_gn")
diff --git third_party/libwebrtc/video/video_stream_encoder_interface_gn/moz.build third_party/libwebrtc/video/video_stream_encoder_interface_gn/moz.build
index d37c5dfac0a7..b8a76706188d 100644
--- third_party/libwebrtc/video/video_stream_encoder_interface_gn/moz.build
+++ third_party/libwebrtc/video/video_stream_encoder_interface_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,97 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "-framework Foundation"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "iphlpapi",
-        "secur32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -142,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -170,40 +74,4 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("video_stream_encoder_interface_gn")
diff --git third_party/libwebrtc/webrtc_gn/moz.build third_party/libwebrtc/webrtc_gn/moz.build
index 8f65ea1e5422..f3f33a009af8 100644
--- third_party/libwebrtc/webrtc_gn/moz.build
+++ third_party/libwebrtc/webrtc_gn/moz.build
@@ -13,14 +13,23 @@ DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
 DEFINES["PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII"] = "0"
 DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
 DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["USE_GLIB"] = "1"
+DEFINES["USE_OZONE"] = "1"
+DEFINES["WEBRTC_BSD"] = True
 DEFINES["WEBRTC_DEPRECATE_PLAN_B"] = True
 DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
 DEFINES["WEBRTC_ENCODER_PSNR_STATS"] = True
 DEFINES["WEBRTC_LIBRARY_IMPL"] = True
 DEFINES["WEBRTC_MOZILLA_BUILD"] = True
 DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_POSIX"] = True
 DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
 DEFINES["WEBRTC_WITHOUT_RUST"] = True
+DEFINES["_FILE_OFFSET_BITS"] = "64"
+DEFINES["_LARGEFILE64_SOURCE"] = True
+DEFINES["_LARGEFILE_SOURCE"] = True
+DEFINES["__STDC_CONSTANT_MACROS"] = True
+DEFINES["__STDC_FORMAT_MACROS"] = True
 
 FINAL_LIBRARY = "xul"
 
@@ -44,130 +53,7 @@ if not CONFIG["MOZ_DEBUG"]:
 if CONFIG["MOZ_DEBUG"] == "1":
 
     DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
-
-if CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["ANDROID"] = True
-    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r27_1"
-    DEFINES["HAVE_SYS_UIO_H"] = True
-    DEFINES["WEBRTC_ANDROID"] = True
-    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_GNU_SOURCE"] = True
-    DEFINES["__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "GLESv2",
-        "log"
-    ]
-
-if CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["WEBRTC_MAC"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    LOCAL_INCLUDES += [
-        "/third_party/libwebrtc/sdk/objc/",
-        "/third_party/libwebrtc/sdk/objc/base/"
-    ]
-
-    OS_LIBS += [
-        "-framework AppKit",
-        "-framework AVFoundation",
-        "-framework CoreGraphics",
-        "-framework CoreMedia",
-        "-framework CoreVideo",
-        "-framework Foundation",
-        "-framework IOKit",
-        "-framework IOSurface",
-        "-framework QuartzCore",
-        "-framework VideoToolbox"
-    ]
-
-if CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["USE_UDEV"] = True
-    DEFINES["WEBRTC_LINUX"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-if CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["USE_GLIB"] = "1"
-    DEFINES["USE_OZONE"] = "1"
-    DEFINES["WEBRTC_BSD"] = True
-    DEFINES["WEBRTC_POSIX"] = True
-    DEFINES["_FILE_OFFSET_BITS"] = "64"
-    DEFINES["_LARGEFILE64_SOURCE"] = True
-    DEFINES["_LARGEFILE_SOURCE"] = True
-    DEFINES["__STDC_CONSTANT_MACROS"] = True
-    DEFINES["__STDC_FORMAT_MACROS"] = True
-
-    OS_LIBS += [
-        "X11",
-        "Xcomposite",
-        "Xdamage",
-        "Xext",
-        "Xfixes",
-        "Xrandr",
-        "Xrender"
-    ]
-
-if CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
-    DEFINES["NOMINMAX"] = True
-    DEFINES["NTDDI_VERSION"] = "0x0A000000"
-    DEFINES["PSAPI_VERSION"] = "2"
-    DEFINES["RTC_ENABLE_WIN_WGC"] = True
-    DEFINES["UNICODE"] = True
-    DEFINES["USE_AURA"] = "1"
-    DEFINES["WEBRTC_WIN"] = True
-    DEFINES["WIN32"] = True
-    DEFINES["WIN32_LEAN_AND_MEAN"] = True
-    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
-    DEFINES["WINVER"] = "0x0A00"
-    DEFINES["_ATL_NO_OPENGL"] = True
-    DEFINES["_CRT_NONSTDC_NO_WARNINGS"] = True
-    DEFINES["_CRT_RAND_S"] = True
-    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
-    DEFINES["_HAS_EXCEPTIONS"] = "0"
-    DEFINES["_HAS_NODISCARD"] = True
-    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
-    DEFINES["_SECURE_ATL"] = True
-    DEFINES["_UNICODE"] = True
-    DEFINES["_WIN32_WINNT"] = "0x0A00"
-    DEFINES["_WINDOWS"] = True
-    DEFINES["_WINSOCK_DEPRECATED_NO_WARNINGS"] = True
-    DEFINES["__STD_C"] = True
-
-    OS_LIBS += [
-        "crypt32",
-        "d3d11",
-        "dwmapi",
-        "dxgi",
-        "iphlpapi",
-        "ole32",
-        "oleaut32",
-        "secur32",
-        "shcore",
-        "strmiids",
-        "user32",
-        "winmm"
-    ]
+    DEFINES["_DEBUG"] = True
 
 if CONFIG["TARGET_CPU"] == "aarch64":
 
@@ -175,25 +61,10 @@ if CONFIG["TARGET_CPU"] == "aarch64":
     DEFINES["WEBRTC_HAS_NEON"] = True
     DEFINES["__ARM_NEON__"] = "1"
 
-if CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["WEBRTC_ARCH_ARM"] = True
-    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
-    DEFINES["WEBRTC_HAS_NEON"] = True
-
-if CONFIG["TARGET_CPU"] == "loongarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 if CONFIG["TARGET_CPU"] == "mips32":
 
     DEFINES["MIPS32_LE"] = True
     DEFINES["MIPS_FPU_LE"] = True
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["TARGET_CPU"] == "mips64":
-
-    DEFINES["_GNU_SOURCE"] = True
 
 if CONFIG["TARGET_CPU"] == "x86":
 
@@ -203,27 +74,7 @@ if CONFIG["TARGET_CPU"] == "x86_64":
 
     DEFINES["WEBRTC_ENABLE_AVX2"] = True
 
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
-
-    DEFINES["_DEBUG"] = True
-
-if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
-
-    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
-
-if CONFIG["MOZ_X11"] == "1" and CONFIG["OS_TARGET"] == "Linux":
+if CONFIG["MOZ_X11"] == "1" and CONFIG["OS_TARGET"] == "FreeBSD":
 
     OS_LIBS += [
         "X11",
@@ -235,20 +86,4 @@ if CONFIG["MOZ_X11"] == "1" and CONFIG["OS_TARGET"] == "Linux":
         "Xrender"
     ]
 
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
-
-    DEFINES["_GNU_SOURCE"] = True
-
-if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
-
-    DEFINES["_GNU_SOURCE"] = True
-
 Library("webrtc_gn")
