I'm able to login in ff in a private window but in a normal one even with all addons disabled I get a never-ending spinner after entering uname/pwd. Has anyone else experienced this?

[Update] If I don't use a password manager to fill the form directly it works for me. If I do use my password manager I get the Spinner Of Doom. (thanks to comment in this thread: https://www.reddit.com/r/Lemmy/comments/145qe4t/cant_log_in_to_lemmy/ )