Sometimes, after restarts, FF forgets every site I'm logged into. Open tabs persist, the login sessions do not. I have no better observation of ''when'' this happens, I'm afraid - it's not every time. Because of this it's very hard to reproduce reliably - over the past 2 weeks, it didn't happen and now it was 2 days in a row. "Clear cookies and site data" is definitely off. I have no extensions apart from Dark Reader and uBlock. Because my daily work requires me to use a dozen sites I have to log into, all using 2FA, this is incredibly annoying. I have also completely reset my profile, which did help for a while but then it started again - so I'm thinking the profile reset was more of a coincidence than actual causality.