https://bugs.kde.org/show_bug.cgi?id=418423

            Bug ID: 418423
           Summary: Firefox window titlebar black after a while
           Product: kwin
           Version: unspecified
          Platform: Kubuntu Packages
                OS: Linux
            Status: REPORTED
          Severity: minor
          Priority: NOR
         Component: appmenu
          Assignee: kwin-bugs-n...@kde.org
          Reporter: tapio.mets...@elisanet.fi
  Target Milestone: ---

Created attachment 126561
  --> https://bugs.kde.org/attachment.cgi?id=126561&action=edit
Window titlebar black, no buttons

SUMMARY

I have updated to KDE 5.18.2. While I am reading the web with Firefox, suddenly
titlebar of the window turns totally black and no buttons exists. (screen
capture included). I can't say what triggers the behaviour, but I didn't have
this kind of behaviour with older KDE versions.

STEPS TO REPRODUCE
1. Open Firefox
2. Browse the Internet awhile
3. Notice that titlebar has disappeared

OBSERVED RESULT
Window titlebar turns totally black

EXPECTED RESULT
Window titlebar is normal with buttons

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: Kubuntu 19.10
(available in About System)
KDE Plasma Version: 5.18.2
KDE Frameworks Version: 5.67.0 
Qt Version: 5.12.4
Window decoration style: air-oxygen

ADDITIONAL INFORMATION
This kind of behaviour happens only with Firefox.

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