No Login with Mac OSX Firefox

hello Forum, since about 3 Weeks I cannot access my Nextcloud from Firefox anymore. I’ll enter my credentials and the login window keeps popping um empty again and again. With a share link, Firefox will open that share as usual, but to access my accounts, I must revert to Safari. However, I’d prefer using Firefox, or to have it available. It looks like this: Nextcloud

What version are you using? Did you update 3 weeks ago?

yes I did every update. Right now Firefox beta 110.0 b4. I managed to go to Nextcloud admin and reset (re-enter) all user passwords and now I can login again which seems a totally unrelated result to me.