--- a/.flake8
+++ b/.flake8
@@ -2,17 +2,19 @@
 # See http://pep8.readthedocs.io/en/latest/intro.html#configuration
 ignore = E121, E123, E126, E129, E133, E226, E241, E242, E704, W503, E402, E741
 max-line-length = 99
 exclude =
     browser/extensions/mortar/ppapi/,
     browser/moz.configure,
     build/moz.configure/*.configure,
     build/pymake/,
+    dom/canvas/test/webgl-conf/checkout/closure-library/,
     editor/libeditor/tests/browserscope/,
+    intl/icu/,
     ipc/chromium/,
     gfx/angle/,
     gfx/harfbuzz,
     glx/skia/,
     js/*.configure,
     memory/moz.configure,
     mobile/android/*.configure,
     node_modules,