worked (for yt) . . . doesnt mean its not a bit sus tho

(2020-09-25) Just used it on soundcloud. It works :)

Very useful addon. Along with this simple ahk script it works in non-focused browser window

#IfWinExist ahk_class MozillaWindowClass
Media_Play_Pause::ControlSend,, {Media_Play_Pause},

goooooooood

Works perfectly on MacOS, just make sure you set up the shortcuts.

Thanks for the update! Is there a chance to include the mixcloud handler?

Great extension.
- minor con: prev./next key == play/pause.
- major pro: works with external devices (e.g. wireless headphones).

Thank you so much for making this. This addon even works from a different window

oh, that's so sad that firefox developers ruin everything. Media keys doesn't work in the background. Perfect Firefox.
Absolutely useless Quantum