[UnlockedSecrets]

I see this on a daily basis, Most times multiple times a day on a Linux KDE Plasma system with it installed natively on OpenSuse Tumbleweed. Best i could describe it is that it happens when i happen to switch to another virtual desktop using keyboard shortcuts on the exact same frame that the tool tip pops up. My guess is it was some kind of race condition that required very precise timing that made it difficult to narrow down, Paired with heavy use of keyboard shortcuts meaning alot of people likely were not effected by it. Very glad to hear it has been fixed and looking forward to getting a version of Firefox with it!

I just did some testing and getting it to happen is as simple as hovering over it, And swapping to another virtual desktop before the popup shows up with firefox not being the new active application.

[prmoustache]

I am in the same boat as the OP. I don't even know where I should click to see a tooltip to begin with!

[bmicraft]

Hover over "X hours ago" of your comment for example

[prmoustache]

Hmmm doesn't appear on my firefox, but I tested and the tooltip appear in ungoogled-chromium so I guess it is blocked by an extension I am using.