I really love this add-on, it's awesome! However... I've had this issue where, when there was a yt vid embedded in a external website, it would sort of "flicker" (the video appears and disappears, without progressing, making it unwatchable). For YEARS I've struggled with this, cleaning cookies, etc, because sometimes it would happen and sometimes not. I would always, ultimately, just watch the video on youtube's website to bypass the problem. Well, with a website I want to use, that won't do for me anymore, so I sat down with the intent to get to the bottom of this. After a lot of troubleshooting, I finally discovered that it was this add-on that was the problem: specifically, the "Disable annotations" option. What a shame, the add-on is a 5/5 otherwise. Hopefully this gets fixed, or if there is no fix, at least a warning that this particular option might cause issues. As for now, I'll simply go ahead and disable that toggle. If you've had this issue too, this is the fix!