Media Previous/Next Track Hotkeys not Working

[numeralnathan]

When I hit the media next or previous key on my keyboard, Google Play Music pauses/resumes the music.
These keys work with desktop application music players. (I do not have these players open at the moment.) I specified MediaPrevTrack and MediaNextTrack without Control, Alt or Shift in the Customize Bindings section. If I right-click on the Google Music Hotkey icon in the toolbar and click on Previous Song or Next Song, then the music goes back or advances a song. So, I know that the functionality could work if the addon could respond correctly to the keys.

[GuilloOme]

Could it be related to this bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1251795#c13 ?