Hello: I found on a help page the info for submitting crash reports, but tonight's crash wasn't listed as a crash. I was just browsing and my screen went blank. When it returned, my tabs came back but they all have to be reset. e.g., I have to log back in to by Twitter, Facebook, and all other password protected accounts. This happens frequently and it is very annoying. I'm reporting this hoping that the problem can be fixed.
Have you tried Firefox in Safe Mode? https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode#search
Also clear your browser cache. https://support.mozilla.org/en-US/kb/clear-cookies-and-site-data-firefox
If you are still having issues, try Windows in Safe Mode. https://www.google.com/search?client=firefox-b-1-d&q=windows+11+safe+mode
What security software are you running?