[Bug 1871644]

[Stransky]

Emilio, you're absolutely right :) There's original Bug 1408360 for it.

For custom themes we need to apply alpha component only and keep
original color from theme (i.e. paint over alpha from theme).

Emilio, how is the best way how to do it? We can introduce a new
appearance (-moz-window-titlebar-alpha for instance) which contains only
alpha component from titlebar and paint it over theme color or use
existing one (-moz-window-titlebar) but I'm not very experienced in
js/css styling so I'll appreciate any help here.

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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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