D23079: [GTK3] Fix Firefox's CSD colors, kinda

[Carson Black]

cblack created this revision.
cblack added a reviewer: VDG.
Herald added a project: Plasma.
Herald added a subscriber: plasma-devel.
cblack requested review of this revision.

REVISION SUMMARY
  This fixes the CSD colors of Firefox to be more legible, but not without some caveats due to upstream issues.
  
  - The inactive titlebar foreground color is used regardless of window state.
  - #MozillaGtkWidget does not have any visible way to discriminate between CSD on and CSD off unlike normal GTK windows, so any style changes apply to both.

REPOSITORY
  R98 Breeze for Gtk

BRANCH
  firefox-csd-fix (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D23079

AFFECTED FILES
  src/gtk3/applications/_firefox.scss
  src/gtk3/gtk.scss

To: cblack, #vdg
Cc: plasma-devel, LeGast00n, jraleigh, fbampaloukas, GB_2, ragreen, Pitel, ZrenBot, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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