It's definitely one of those things that can drive someone a little crazy. My solution was to activate/trigger another tooltip, that would make the frozen one

It's definitely one of those things that can drive someone a little crazy. My solution was to activate/trigger another tooltip, that would make the frozen one disappear, and hope the new one would behave normally. Wasn't ready to give up Firefox, but can't say that the thought didn't cross my mind. Now that I think about it, still to this day I see similar issues in other apps where some kind of popup/overlay/tooltip persists across tabs/windows/applications.