diff --git a/.clang-format-ignore b/.clang-format-ignore
index e78ab84b7704..e2cfc0f39ebb 100644
--- a/.clang-format-ignore
+++ b/.clang-format-ignore
@@ -118,29 +118,16 @@ testing/gtest/gtest/.*
 testing/talos/talos/tests/dromaeo/.*
 testing/talos/talos/tests/kraken/.*
 testing/talos/talos/tests/v8_7/.*
+testing/web-platform/tests/resources/webidl2/.*
 third_party/aom/.*
-third_party/python/blessings/.*
-third_party/python/configobj/.*
-third_party/python/futures/.*
-third_party/python/jsmin/.*
-third_party/python/mock-*/.*
-third_party/python/psutil/.*
-third_party/python/py/.*
-third_party/python/pyasn1/.*
-third_party/python/pyasn1-modules/.*
-third_party/python/PyECC/.*
-third_party/python/pytest/.*
-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/msgpack/.*
+third_party/prio/.*
+third_party/python/.*
 third_party/rust/.*
 toolkit/components/jsoncpp/.*
 toolkit/components/protobuf/.*
 toolkit/components/url-classifier/chromium/.*
 toolkit/components/url-classifier/protobuf/.*
 toolkit/crashreporter/google-breakpad/.*
+toolkit/recordreplay/udis86/.*
 tools/fuzzing/libfuzzer/.*
diff --git a/tools/rewriting/ThirdPartyPaths.txt b/tools/rewriting/ThirdPartyPaths.txt
index 7229f3ebcc83..42c2b7a78e86 100644
--- a/tools/rewriting/ThirdPartyPaths.txt
+++ b/tools/rewriting/ThirdPartyPaths.txt
@@ -86,29 +86,16 @@ testing/gtest/gtest/
 testing/talos/talos/tests/dromaeo/
 testing/talos/talos/tests/kraken/
 testing/talos/talos/tests/v8_7/
+testing/web-platform/tests/resources/webidl2/
 third_party/aom/
-third_party/python/blessings/
-third_party/python/configobj/
-third_party/python/futures/
-third_party/python/jsmin/
-third_party/python/mock-*/
-third_party/python/psutil/
-third_party/python/py/
-third_party/python/pyasn1/
-third_party/python/pyasn1-modules/
-third_party/python/PyECC/
-third_party/python/pytest/
-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/msgpack/
+third_party/prio/
+third_party/python/
 third_party/rust/
 toolkit/components/jsoncpp/
 toolkit/components/protobuf/
 toolkit/components/url-classifier/chromium/
 toolkit/components/url-classifier/protobuf/
 toolkit/crashreporter/google-breakpad/
+toolkit/recordreplay/udis86/
 tools/fuzzing/libfuzzer/