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!

It doesn't use global hotkeys like it claimed (at least thats what i understood)
On spotify, the forward, play/pause, previous, all these just does the same as play/pause.

Very useful! Thank you very much!