The passwords drive me mad - follow up

Should anyone be interested, I found out what the matter was when I suddenly read at the top of the screen "Mozilla Firefox (private browsing)".
I just deactivated and things went back to normal.

FYI: I do just the opposite, because I insist on logging in each time for privacy. This is necessary because I may not always be the only user of this computer.

My Firefox i set this way: Firefox>Options>Privacy>Never Remember History

That permanently gives you behavior very similar to the private browsing mode.

For me, logging each time is a chore. And I'll always be the only user of this PC...till I kick the bucket. So I couldn't care less.