Firefox seemingly very recently shipped their own titlebar controls buttons, which worsens even further the lackluster OS integration. In the screenshot you see my regular control buttons on the window to the left (default KDE Plasma theme) and the new custom buttons Firefox is serving now.
Would anyone know how to undo that change in about:config or anywhere else?
Damn, but I’m not sure if I agree with gregp’s resolution of the bug. The way I understand the changes in https://bugzilla.mozilla.org/show_bug.cgi?id=1964046, it should still use the system theme, but rendered by firefox itself. However, the current state is that it doesn’t follow the system theme anymore :/
EDIT: I just saw this comment: https://lemmy.world/comment/17957836 And yep, that’s correct. I’m also using the Papirus icon theme, when I change the theme to breeze or something else, the buttons in firefox titlebar also reflect this change after a restart. So Firefox is now using the
window-{maximize,minimize,close,....}-symbolicicons from the icon theme and not from the window decorations setting.