The only downside is that, it used to work perfectly on youtube playlists, but then something changed and now any time a playlist switches to the next track it resets the audio device. It would be nice if the add-on would work around page reloads on the same domain, or if settings could be retained on a per-sub-domain basis ( did anyone found a solution to it ? im having the same issues and let s say i select my tv to listen the youtube music after it skips to the next music the sound resets and back everytime to the headset and i gotta do it over again and again )

It works, but it's kind of selective. Just do the about:config thing when it asks you to and see which sites it works on.

Indeed,since latest mozilla update this addon stopped working properly,for some reason sees only plugged in audio channels,non bluetooth or wireless :(

"Permission denied" on Youtube