One of the best extensions I've used, I am using it for deezer, works great!

There's a message window everytime I open youtube:

--------------- 8< -------------------
It is most likely that this key combination is already in use by another application. Find that app, and make it release this hotkey. Possibly could be in use by the "Global Keyboard Shortcuts" of the system - http://i.imgur.com/cLz1fDs.png
Details: Was not able to register the `code_os` of `172` on `grabwin` of `180`. Other info: `grabwins`: 180 codes_os: 172,208,215 code: 269025044
Offending Hotkey Combination: Media Key: Play (Capslock:Off, Numlock:Off)
--------------- >8 -------------------
Ubuntu 16.04 x64

Works great on a Macbook pro with Firefox 49, thanks!

it works on microsoft keyboard 600

I had an issue with the addon preferring youtube over pandora, but the pin media keys feature fixed it. Carlin was kind enough to reply with that tip when I emailed him. Thanks!

Unfortunately doesn't work with Logitech K350, Win 10

Edit: Thanks for advice. Disabled Logitech app helped. Youtube still doesn't work, but it's not important.

Working really well on Ubuntu 16.04 (didn't test on Windows yet)
Besides it, is open source! That's awesome too! Thank you very much!

The addon is great and works as intended, but I would like an option to disable this on youtube, I dont need the media keys on youtube

When a video is left to play to completion, paused videos or (maybe) other kinds of unplayed videos begin playing either in the tab or in other tabs.

Edit: This behavior is configurable. I think it would be better disabled as default.

The windows alternative key support made this work perfectly for me, but in no world should the 'Play/Pause media automatically' setting default to on.
I thought firefox had just decided to make the internet a worse place, not realising it was a part of this addon. Please make it default to the default behaviour of firefox :)

A very useful add-on it saved me a lot of time

However, I encountered a problem while dealing with Youtube playlists I can control the first video/song and if I move to the next one the keys don't work anymore unless I reload the page ( it's really troublesome) .
Please fix it if you can.

Update: I'm terribly sorry , it was my fault I kept a muted soundcloud tab open along with the Youtube playlist which confused the Add-On which prioritized the soundcloud songs over the Youtube playlist . I retried it now and it seems to be working :)
It would be awesome if there's an option to choose which one to control

Пара кликов,установилось без перезапуска браузера.Работает отлично!!!

Works great on Linux!

A fantastic extension that works well.

This should be included with Firefox by default.

doesn't work where there on embedded video or audio
doesn't work on private browsing
everywhere else works 100% for me

I was gladly surprised to see it work on Pocket Cast website.

Keep up the good work!

Working great on ArchLinux's Gnome, but would be gread if Mac OS X could be also supported.

Update for new VK design please

Une extension parfaite.

Like the developer, I was tired of switching tabs to play/pause when I had a full set of media keys on my keyboard. This extension allows me to control SoundCloud with ease and it works even when the Firefox window is not active.

I highly recommend this extension to anyone who uses media keys.

Я время от времени слушаю музыку через социальную сеть vkontakte и во время игровых сражений отвлекаться от игры для переключения нежеланного трека нет времени, этот аддон работает в directx приложениях, проще говоря при полном экране.
/////////////////
Vkontakte - Worked & worked in full screen game, video etc.

Great

It works as expected when I have only one compatible site opened. Thanks!

When opening a second site I think the controls should then control the second site until it's closed.

Thanks dude. Does exactly what you would expect. Works with Google Play even when the tab or browser window is not active.

The missing-link in turning Firefox into a fully-fledged media-player. Also greatly appreciate the recently added support for the Plex web-player!