Bug 902974 - [Music] [User Story] Utility tray should display information about the song when music is still playing
Merge pull request #11847 from jimporter/music-nowplaying-notification

Bug 902974 - [Music] [User Story] Utility tray should display information about the song when music is still playing; r=alive, r=lightsofapollo, r=dkuo, r=djf, ui-r=robmac