Oh wow, I always just assumed it was somehow my fault. This has been following me for years, over different Windows versions and reinstalls. It didn’t happen often, but still regularly enough that I remember it.
Yeah this happens a lot when the DOM changes and the app loses the track of the tooltip so it can no longer dispose of it when you navigate away from the target.
Imagine how much money Mozilla could have made over the last 22 years if only they'd sold ad space in the stuck tooltip! They should monetized their own bugs, before somebody else does.
