Comment # 2 on bug 1199941 from Matthias Bach

I finally had some time to look into this again and it seems like this was
fixed a while back���������in 2020���������for Factory with release 5.0.6 of kmozillahelper via
https://github.com/openSUSE/kmozillahelper/commit/7dd7f451d693743181625708210c21b06c9a7895.

As Leap 15.4 is still shipping 5.0.5, I think it would be great if we could
bump that to 5.0.6 for an easy fix for everyone that might not even be aware of
why they suddenly can no longer start further apps.

Looking at the fix there's also a simple workaround for anyone immediately
affected: Add "/usr/lib/mozilla/kmozillahelper" to the list of applications to
be ignored by KDE session management in the KDE System Settings / Startup and
Shutdown / Desktop Session.