Roll20 is triggering a Youtube Pause function of an add-on

I have an add-on for Firefox ("Enhancer for Youtube") that has a function (" Pause videos playing in background tabs when a video starts playing in the foreground tab") within that pauses other videos if a new youtube video begins to play. If I'm listening to music, it saves me having to pause the music if I load up another video. Roll20's VTT is triggering this function despite no videos being shown.

Yes, that's possible. Roll20 doesn't support or recommend using any browser extensions (add-ons) as they may conflict. It's recommended to run Roll20 with those extensions disabled. In the case you're mentioning, this will be outside the areas Roll20 can directly help with.  Are you a player or a GM, or this happens regardless?  If you're looking to troubleshoot the reason why, animated campaign background images in Roll20 are considered videos to the web browser, and these are only used by Roll20 subscriber GM's, so you might have that if you are a Player in a game ran by a Roll20 subscriber. Animations within the tabletop may also be detected as videos, these don't have to be a subscriber to use them. Music playing in a roll20 tabletop is another area that might pick-up as "video" playing. 

I recommend running Roll20 games in an Incognito / Private Browsing window always. 

Gold said: Yes, that's possible. Roll20 doesn't support or recommend using any browser extensions (add-ons) as they may conflict. It's recommended to run Roll20 with those extensions disabled. In the case you're mentioning, this will be outside the areas Roll20 can directly help with.  Are you a player or a GM, or this happens regardless?  If you're looking to troubleshoot the reason why, animated campaign background images in Roll20 are considered videos to the web browser, and these are only used by Roll20 subscriber GM's, so you might have that if you are a Player in a game ran by a Roll20 subscriber. Animations within the tabletop may also be detected as videos, these don't have to be a subscriber to use them. Music playing in a roll20 tabletop is another area that might pick-up as "video" playing.  That animated background bit sounds like it might be the exact issue. I'll look into it some more, thank you!