every piece of software out there that is X years old has bug reports that have gone unfixed for nearly X years.
sometimes it's a bug that impacts you directly and that's sad.
it does not help to call out the developers over the bug, which is how posts like this one probably feel to any mozilla devs who have to be watching
neither do comments on the bug that are not directed at understanding a fixing the bug
so what are you trying to accomplish? are your actions actually helping accomplish it?
It was, more than anything, intended to offer a noticeable bump in hopes that I don't have to continue wasting 5 seconds finding and closing the window every time I open Firefox (as I have had to do since using this feature over the last hand full of years). I've probably spent (roughly) 2 hours of my life closing these duplicate prompts over time.
It's an annoying user experience that seems fixable which is why I'm surprised it still remains at "normal" priority. I would spend the time to read every comment, read through and understand the architecture of this legacy code, fix the bug and submit a patch only to have it code reviewed and have me resubmit or be forced to resign my attempt because political reasons or some other factor, but that would probably take me more than 2 hours so I refrain and hope that it gets fixed in the next 7 years.
Not intending to be snide, just a moderately inconvenienced user trying to stir action.