After updating to plasma 5.25.5 my color scheme for firefox itself and file save dialogs in firefox/brave/vscode are changed to breeze-like (not my selected system theme), e.g.:
And that approximately how it should have been looked/looked before 5.25.5:
Well just for a quick test, hit the menu and call up ‘application style’.
Check the ‘GTK theme’ option - set it to Aidwaita-dark (should be a guaranteed success there) and see how it goes, then check the one you might wanna switch to. I can’t understand why it’s not following your colour scheme…
Having said that, mine uses the KDE picker, so it follows my colour scheme…
Using application style (Breeze, or Lightly - follows colour scheme)
Doesn’t seem to make any difference at all. For the reference, I’ve enabled such file dialog for KDE with this options in firefox’s about:config (through user.js)
user_pref("widget.use-xdg-desktop-portal", true);
user_pref("widget.use-xdg-desktop-portal.kde", true);
user_pref("GTK_USE_PORTAL", 0);
user_pref("widget.use-xdg-desktop-portal.file-picker", 1);
Hmmmm nothing else playing up?
New Firefox profile doing the same?
Mine’s right on the colour scheme.
I’m sure what you’ll see there is GTK - mine follows ‘Application Style’ set to Aidwata dark right now. (can’t spell that for TOFFEE).
Good luck 
maybe delete Firefox profile, make it again, then sync.
Had the same thing this morning, xdg-desktop-portal-kde dumped core.
Restarting the service (and possibly browser, don’t remember exactly) fixed it for me:
$ systemctl --user restart plasma-xdg-desktop-portal-kde.service
And here comes the solution. Thanks!
Upd. Seems like I have to run this command each time the system starts. I tried to reinstall xdg-desktop-portal and xdg-desktop-portal-kde, but that didn’t help. Any way to workaround this?
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