(In reply to Darkspirit from comment #19)
> KDE with disabled compositor, i3, etc. use alpha visual, but it's not 
> transparent.

WDYM, just that the background wouldn't be transparent?

> Could -moz-gtk-csd-transparent-background be defined with 
> gdk_screen_is_composited()
> and be used to forbid outer border-radius + outer shadow of main 
> menu/addon/etc. widgets
> to remove any Xshape usage (bug 1730991 comment 6)?
> According to the Chromium bugtracker, Xshape also causes performance problems 
> (bug 1730991 comment 7).

I'm not sure about this (not familiar with XShape at all).

This patch stack makes Wayland look great, but on X11/XWayland I still
see the compositor shadow drawn around the crisp corner when using a
lightweight theme... Do you know whether that's avoidable Martin?

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https://bugs.launchpad.net/bugs/1871644

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

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