hello, could you provide your latest few submitted crash reports? please enter about:crashes into the location bar, copy the latest few report ids from there starting with bp- & paste them here into a forum reply. this will give us a better understanding what may be triggering those crashes.

bp-a9ea7d21-184a-4888-89d1-511381171211, bp-4f67efa8-2cd4-4bf1-a14f-a61d21171211, bp-bc8abd2b-f739-4e33-9c40-cb5321171211, bp-2653e3a4-d6ef-4333-9669-8965d1171211

thanks, is this on an insider build? unfortunately you appear to be the only user with this type of crash right now judging by the data on mozilla's crash stats server so it's hard to give any particular advice based on that...

are you able to get firefox to run in safemode without crashing by pressing the shift key while it is launching? does it make a difference when you try the beta version from https://www.mozilla.org/de/firefox/channel/desktop/?

Not an insider build. It randomly started working again.