[Bug 1871644]

[B-emilio]

Created attachment 9246287
Bug 1509931 - Add support for chrome-only environment variables. r=stransky


This bit is taken straight from D73454 (I reviewed it but I guess
another pair of eyes is ok, it's really straight-forward).

Co-authored-by: Nicklas Boman <smurfd at gmail.com>

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Title:
  Top corners of Firefox windows have weird black protrusions from the
  rounded edges

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