https://bugs.kde.org/show_bug.cgi?id=443529

            Bug ID: 443529
           Summary: Cannot enter fullscreen on Firefox
           Product: kwin
           Version: 5.22.5
          Platform: Fedora RPMs
                OS: Linux
            Status: REPORTED
          Severity: minor
          Priority: NOR
         Component: general
          Assignee: kwin-bugs-n...@kde.org
          Reporter: nandog123...@gmail.com
  Target Milestone: ---

SUMMARY
Trying to fullscreen a video in firefox results in a black screen until you are
able to exit.

STEPS TO REPRODUCE
1. Open Firefox
2. Play a video on any site (I used YouTube)
3. Attempt to fullscreen the video

OBSERVED RESULT
You're given a black screen that will stay there until you are able to exit
fullscreen

EXPECTED RESULT
The video going into fullscreen mode.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora 34
KDE Plasma Version: 5.22.5
KDE Frameworks Version: 5.85.0
Qt Version: 5.15.2

ADDITIONAL INFORMATION
This is my first bug report, sorry if I did any of this wrong. This problems
doesn't happen in Gnome. 

setting full-screen-api.ignore-widgets to true in about:config somewhat fixes
the issue, the top window border is still there though and I don't think its a
proper solution. 

This line is also in my journalctl:
Oct 09 15:29:16 fedora kwin_x11[2724]: qt.qpa.xcb: QXcbConnection: XCB error: 3
(BadWindow), sequence: 24833, resource id: 113246216, major code: 18
(ChangeProperty), minor code: 0

I'm 99% sure they are related, as the error happens when I try to fullscreen.
Thanks.

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