On my Android phone (Nokia 9, FF 68.1.1), I frequently (after a couple of minutes of inactivity) need to do a strange "reset" in order to allow sessions to work properly on websites. It applies to _all_ websites that use some kind of session, my best guess is cookies. Symptom: website no longer recognizes the session, either asks for a user name and password (and keeps failing), or shows notices of using ad-blockers, showing generic content instead of customized view, etc. Regain sessions: go to Tools -> Logins (spinner will show, but logins will never appear). Close Firefox. Open Firefox. All pages work again!