Here is a FIX for the new Material design Avaliado em 5 de 5 estrelas

Just replace line 34 in the main.js file in the extension with the following:
contentScript: "(document.getElementsByClassName('material-player-middle')[0].childNodes[" + act + "]).click();"

Cheers :)

Essa avaliação é para um versão anterior do complemento (0.7.1-signed). 

new version available

thanks for your help bringing this to my attention. You can add a new version of this addon from here: https://addons.mozilla.org/en-US/firefox/addon/google-music-hotkeys/versions/?page=1#version-0.8

Lost functionality Avaliado em 5 de 5 estrelas

This addon fails to control Google Music after recent Material redesign.

UPDATE. Everything is back to great after update. Cheers.

Essa avaliação é para um versão anterior do complemento (0.7.1-signed).  Esse usuário tem uma análise anterior desse complemento.

New version available

thanks for your help bringing this to my attention. You can add a new version of this addon from here: https://addons.mozilla.org/en-US/firefox/addon/google-music-hotkeys/versions/?page=1#version-0.8

Awesome Avaliado em 5 de 5 estrelas

If you want to collaborate, I made another add-on similar to this one.

It's not a big thing, but it's working. Also, you can customize the hotkeys :
https://addons.mozilla.org/en-US/firefox/addon/google-music-control/

Essa avaliação é para um versão anterior do complemento (0.7.1-signed). 

Thanks! I'm not sure how you want to collaborate since we are both doing such similar things, but if you have any particular ideas let me know.

Avaliado em 4 de 5 estrelas

Nice addon, however Play/Pause shortcut ctrl+alt+p doesn't work for me. Next and Prev are functional.

Essa avaliação é para um versão anterior do complemento (0.7.1-signed). 

Avaliado em 5 de 5 estrelas

Works as described, scratches a big itch!

Essa avaliação é para um versão anterior do complemento (0.7.1-signed). 

Avaliado em 4 de 5 estrelas

I would like to collaborate in the development of the addon. I would like to make hotkeys customizable.

Essa avaliação é para um versão anterior do complemento (0.7.1-signed). 

I would gladly welcome your help. What is the best way to get in touch with you so we can coordinate?

Firefox 30.0, Windows 8.1 x64 Avaliado em 4 de 5 estrelas

Extension works OK. Please add like/dislike and support of hardware multimedia keys.

Essa avaliação é para um versão anterior do complemento (0.7.1-signed). 

Needs 2 hands but works! Avaliado em 4 de 5 estrelas

They're not the hotkeys I would have picked but the addon works perfectly. I'd have preferred to set my own hotkeys - I would have picked something like CTRL-ALT-W which I could input with one hand.

Essa avaliação é para um versão anterior do complemento (0.7.1-signed). 

Avaliado em 5 de 5 estrelas

Almost perfect. This plus AutoHotKey to switch focus back and forth gives me global media keys. Finally.

Essa avaliação é para um versão anterior do complemento (0.7.1-signed). 

Thank you for this Avaliado em 5 de 5 estrelas

I had almost given up being able to control Google Music with the keyboard. This works really well.

Essa avaliação é para um versão anterior do complemento (0.7.1-signed). 

Avaliado em 5 de 5 estrelas

OMG, thank you! Hate that there's no desktop client, and Chrome hiccups the music too much. You saved my subscription.

Please add a hotkey for searching google music. Thanks!

Essa avaliação é para um versão anterior do complemento (0.7.1-signed). 

Avaliado em 5 de 5 estrelas

I thought "hey, there should totally be an extension that does this," and here it was. No restart, 5 seconds later I'm pausing and unpausing my music like a pro.

Essa avaliação é para um versão anterior do complemento (0.7.1-signed). 

Avaliado em 5 de 5 estrelas

Any update on the prev/next keys not working? Would be really fantastic if you could fix this.

Edit: fixed, thank you!

Essa avaliação é para um versão anterior do complemento (0.6.1-signed). 

I have updated this to version 0.7 :

https://addons.mozilla.org/en-US/developers/addon/google-music-hotkeys/versions/1504714

which should re-enable the next/prev functionality.

Stopped working. Avaliado em 1 de 5 estrelas

The "Next" & "Prev" buttons no longer work :(

Essa avaliação é para um versão anterior do complemento (0.6.1-signed).  Esse usuário tem uma análise anterior desse complemento.

I have updated this to version 0.7 :

https://addons.mozilla.org/en-US/developers/addon/google-music-hotkeys/versions/1504714

which should re-enable the next/prev functionality.

Great addon - and how to make it work with system-wide shortcuts (Linux) Avaliado em 4 de 5 estrelas

Love this - but not a fan of the shortcut combos - nor the fact that they aren't global.

To fix this, simply map your favourite key-shortcut to the following commands:
Next track: xdotool key --clearmodifiers --window `(xdotool search --classname Navigator | head -1)` ctrl+alt+period
Previous track: Next track: xdotool key --clearmodifiers --window `(xdotool search --classname Navigator | head -1)` ctrl+alt+,
Play/Pause: Next track: xdotool key --clearmodifiers --window `(xdotool search --classname Navigator | head -1)` ctrl+alt+p

If you're using KDE:
1. From system settings choose "Shortcuts and Gestures"
2. Under "custom shortcuts" choose Edit->New->Global shortcut->Command/URL
3. Give your shortcut a nice name and comment (optional)
4. Under the Trigger tab, select the keycombo you'd like to use. I suggest using Ctrl with your media keys
5. Under Action, enter the appropriate command (as given above)
6. Repeat steps 2-5 for the other two commands given above.

Essa avaliação é para um versão anterior do complemento (0.6.1-signed). 

Avaliado em 3 de 5 estrelas

Great addon, would be great if the keys were global throughout the OS

Essa avaliação é para um versão anterior do complemento (0.6.1-signed). 

Works great Avaliado em 5 de 5 estrelas

For you those don't understand how to use it, this addon allows you to control Google Play Music from any tab in your browser.

This only works for Google Play Music (as far as I know), which is at play.google.com/music

There's three simple shortcuts. These are all keyboard shortcuts.

To pause the currently playing music, or continue the paused music press:
CTRL ALT P
That's the CTRL key, plus the ALT key (both located in the bottom left of your keyboard), then the P key, as in the letter p!

This also applies to the other shortcuts like next song and previous song. The only difference is that to skip a song, press the PERIOD key ( . ) That's located just above and a little to the right of the space bar.
To go to the previous song, just use the same combination (CTRL + ALT), but this time, press the COMMA key ( , ) located above the right end of the space bar.

Essa avaliação é para um versão anterior do complemento (0.5.1-signed). 

Works as designed :) Avaliado em 5 de 5 estrelas

Does exactly what it says, works as intended.

The standard improvements would be cool:
- Customizable keys
- thumbs up/down for the current track
- volume up/down

Essa avaliação é para um versão anterior do complemento (0.5.1-signed). 

Thanks a LOT!!! <3 Avaliado em 5 de 5 estrelas

Superb stuff! Just what I needed! And works perfectly!

Essa avaliação é para um versão anterior do complemento (0.5.1-signed). 

Avaliado em 1 de 5 estrelas

Unfortunately, the instructions are vague. Please write appropriate instructions.

Essa avaliação é para um versão anterior do complemento (0.5.1-signed).