For me, Google’s music streaming service has become my main music player but as a former Winamp user I miss the comfort of controlling my music via media keys. Switching to the browser every time I want to skip a track is a huge drawback in comfort and makes my Logitech G510’s media keys feel sad and unloved.
Good for me that Firefox user Xerravin created a wonderful add-on with the simple name Google Music Media Key Fix that fixes this issue. It works like a charm and you can play, pause, stop, skip to the next an previous song in Google Music. No matter if you are in a different tab or if Firefox is minimized. So go ahead and try it out.