Same problem as another user, this only allows me to pause or unpause.

No skip or last track functionality.

Corsair K70
-Google Play Music
-Youtube

not working, it only pause or mute sounds...

Не работают медиа клавиши в Яндекс Музыки.
Если настройки не делать, то любая медиа клавиша на клавиатуре кроме паузы/воспроизведения ничего не может сделать.
Если сделать настройки и сохранить, то клавиши не работают.

Works fine, but the browser window still needs to be selected for it to work.

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

In Spanish keyboard, it only obeys to the dieresis key. Despite having specified a custom shortcut.

Play/Pause Works, but only when Firefox is selected. Forward and Backward don't work at all.

Legendary. Makes streaming at work viable again. Thanks!

The browser has to be in focus for the media keys to register!

Like, wtf is the point of having this add-on, even???
You can't use it when playing a game, or streaming, or, like I said, when you don't have the browser in focus.

Absolutely WORTHLESS add-on, IMO.

For those of you who want to watch/listen to Youtube content while playing a game, use MPC-BE, copy the link location, add the link to the media player and use the media keys to control it. (I can only get pause/play, mute and volume to work, not next/previous.)

The Skipping buttons doesnt work, all it does is pause the videos.

Does what it needs to do, very useful for headphone users with touchscreen.

EDIT
Still an amazing addon, I use it almost every day