Firefox acted a bit weird, the fix was to use the ‘refresh Firefox’ option which kind of reinstalls Firefox while keeping all your settings, bookmarks etc.
Except it deletes all your addons. Including Tampermonkey and all the scripts.
Just spend an hour on finding and setting up all the scripts I was using again.
In the dashboard of Tampermonkey there’s an option on the right (Services I think, I’m using a Dutch version) and there you can easily export your scripts to a zipfile.
That at least saves you the hassle of having to find all the scripts again
