Bookworm: kwin and plasmashell errors in the log

[local10 <local10@tutanota.com>]

Hi,

Am getting quite a few kwin and plasmashell errors in the log ( see https://pastebin.com/LuK4AAi6 ) and since upgrading to Firefox 102, FF seems to be very unstable (hangs at least 2-3 times a day). I was blaming FF before but now looking at the errors it occurred to me that the problem may be with KDE.

Any ideas what could be done about those errors?

Thanks

Operating System: Debian GNU/Linux
KDE Plasma Version: 5.26.0  KDE Frameworks Version: 5.98.0  Qt Version: 5.15.6
Kernel Version: 6.0.0-2-amd64 (64-bit)
Graphics Platform: X11