--- a/.clang-format-ignore
+++ b/.clang-format-ignore
@@ -34,17 +34,16 @@
 ^xpcom/glue/tests/.*
 ^xpcom/tests/.*
 
 # Generated from ./tools/rewriting/ThirdPartyPaths.txt
 # awk '{print "^"$1".*"}' ./tools/rewriting/ThirdPartyPaths.txt
 ^browser/components/translation/cld2/.*
 ^browser/extensions/mortar/ppapi/.*
 ^db/sqlite3/src/.*
-^dom/media/platforms/ffmpeg/libav.*
 ^extensions/spellcheck/hunspell/src/.*
 ^gfx/angle/.*
 ^gfx/cairo/.*
 ^gfx/graphite2/.*
 ^gfx/harfbuzz/.*
 ^gfx/ots/.*
 ^gfx/qcms/.*
 ^gfx/sfntly/.*
@@ -79,18 +78,17 @@
 ^media/libvpx/.*
 ^media/libyuv/.*
 ^media/mtransport/third_party/.*
 ^media/openmax_dl/.*
 ^media/sphinxbase/.*
 ^media/webrtc/signaling/src/sdp/sipcc/.*
 ^media/webrtc/trunk/.*
 ^mfbt/decimal/.*
-^mfbt/double-conversion/source/.*
-^mfbt/lz4.*
+^mfbt/double-conversion/double-conversion/.*
 ^mobile/android/geckoview/src/thirdparty/.*
 ^mobile/android/thirdparty/.*
 ^modules/brotli/.*
 ^modules/fdlibm/.*
 ^modules/freetype2/.*
 ^modules/libbz2/.*
 ^modules/libmar/.*
 ^modules/pdfium/.*
@@ -125,13 +123,14 @@
 ^third_party/python/pyyaml/.*
 ^third_party/python/redo/.*
 ^third_party/python/requests/.*
 ^third_party/python/rsa/.*
 ^third_party/python/six/.*
 ^third_party/python/which/.*
 ^third_party/rust/.*
 ^toolkit/components/jsoncpp/.*
+^toolkit/components/lz4/.*
 ^toolkit/components/protobuf/.*
 ^toolkit/components/url-classifier/chromium/.*
 ^toolkit/components/url-classifier/protobuf/.*
 ^toolkit/crashreporter/google-breakpad/.*
 ^tools/fuzzing/libfuzzer.*

--- a/tools/rewriting/ThirdPartyPaths.txt
+++ b/tools/rewriting/ThirdPartyPaths.txt
@@ -1,12 +1,11 @@
 browser/components/translation/cld2/
 browser/extensions/mortar/ppapi/
 db/sqlite3/src/
-dom/media/platforms/ffmpeg/libav
 extensions/spellcheck/hunspell/src/
 gfx/angle/
 gfx/cairo/
 gfx/graphite2/
 gfx/harfbuzz/
 gfx/ots/
 gfx/qcms/
 gfx/sfntly/
@@ -41,18 +40,17 @@ media/libvorbis/
 media/libvpx/
 media/libyuv/
 media/mtransport/third_party/
 media/openmax_dl/
 media/sphinxbase/
 media/webrtc/signaling/src/sdp/sipcc/
 media/webrtc/trunk/
 mfbt/decimal/
-mfbt/double-conversion/source/
-mfbt/lz4
+mfbt/double-conversion/double-conversion/
 mobile/android/geckoview/src/thirdparty/
 mobile/android/thirdparty/
 modules/brotli/
 modules/fdlibm/
 modules/freetype2/
 modules/libbz2/
 modules/libmar/
 modules/pdfium/
@@ -87,13 +85,14 @@ third_party/python/pytoml/
 third_party/python/pyyaml/
 third_party/python/redo/
 third_party/python/requests/
 third_party/python/rsa/
 third_party/python/six/
 third_party/python/which/
 third_party/rust/
 toolkit/components/jsoncpp/
+toolkit/components/lz4/
 toolkit/components/protobuf/
 toolkit/components/url-classifier/chromium/
 toolkit/components/url-classifier/protobuf/
 toolkit/crashreporter/google-breakpad/
 tools/fuzzing/libfuzzer