Simple and working (no need to restart or reload or anything).
Don't need focus in my case (using pined tab).
-1 cause prev / next doesn't works (only play/pause).

Works properly

Nice ! I was looking for a way to play/pause youtube videos via my bluetooth headset and this does the job perfectly.
Infortunately I'm not able to use the next/previous track inputs.

The addon works fine.... except that every media key is getting redirected to MediaPause when playing on YouTube. Would have given it a 5 star if it was able to properly skip a track instead of pausing it, if prompted.

Works as advertised for Spotify free. If only the bug preventing skipping was patched...

Thanks for porting it to quantum!
The only thing is that the keys just pause and resume the video, while in old version for ESR if i remember you could use the right buttons to change playlist song to next and etc.
Anyways very good addon, i needed this so badly!