Very nice add-on.
One more function would be very nice, instead of turning off ads completely, just to mute them automatically.
Also I was looking for a solution for YT shuffling issue (for playlists over 200 videos), I know they can't fix it for some time already, I sent a feedback but I wonder if they will do anything about it now.
But if there's a way to access the complete playlist (not only the part lazy loaded on the site), I think it should be possible to make shuffled version and play it instead of YT flawed one.