I added it to Waterfox recently and it has worked almost flawlessly, the popup only appeared briefly once, I truly recommend it. I will let you know if something goes wrong.

Tested on mobile version with a Samsung Flip, it works without any problems. I haven’t tested the PC version

Barely does anything. Video still pauses but i think that it unpauses when i am about to go to the tab.

Does seem to do the job