I have been here before. Firefox not only crashes (that would be okish) but it takes the KDE Desktop with it, making it super difficult to trouble shoot. In what way can I isolate an application from doing such nasty things to the KDE desktop?
Try creating a new USER and see if it happens there - this is something that really makes little sense, so first check if it’s Plasma or Firefox.
After that, create a new Firefox profile and test that.
If you’re asking for help, you must give relevant information - try something like inxi -zv8 or even just kinfo.
💡 Legibility Tip pasting code
When posting terminal output, copy the output and paste it here, wrapped in three (3) backticks, before AND after the pasted text. Like this:
```
pasted text
```
Or three (3) tilde signs, like this:
~~~
pasted text
~~~
Information from logs, or just output launching in the terminal can help too…
In this case it was the (nvdia) rpmfusion graphic drivers that were not updated in a dnf up the is running automatically.