KDE has KWin set to not used a gradient in the windeco for Firefox and Thunderbird windows. This is configurable from System Settings -> Appearance -> Windows, in the Window-Specific Overrides tab.
Personally, I think it'd be good to get this upstream, too.
KDE has KWin set to not used a gradient in the windeco for Firefox and Thunderbird windows. This is configurable from System Settings -> Appearance -> Windows, in the Window-Specific Overrides tab.
Personally, I think it'd be good to get this upstream, too.