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?
I had this problem as well. It came down to what I was using in the user login field. You can choose either username or email. When I chose email, it would just spin forever. However, if I used my "name", it worked.
I also sometimes experience that issue, check in developer console if you don't have errors with websocket connections. Not sure what causing that (my side/server side), but most of the time CTRL+F5 (refresh with clearing cache) fixes the issue