[Bug 1871644]

[B-emilio]

Created attachment 9246290
Bug 1509931 - Remove -moz-gtk-csd-transparent-background. r=stransky


We always use alpha visual for WebRender, and appearance: none is
unnecessary (root element has no intrinsic appearance).

Depends on D128681

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

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