For a while I've used the media keys (play/pause, back, and forward) with either Spotify or iTunes, whichever was open. But now I'm trying to pause spotify while it's playing music and the buttons instead control a video in my browser. First it was a YouTube video, but when I closed that it instead controlled a lecture recording in some other video player which I didn't even know was possible. It's not until all possible play/pause tabs in Chrome are closed that I'm able to control Spotify with the media buttons again. Any help regarding how to prioritize certain programs over others would be nice. Thanks.