Now playing/media controls missing in sound indicator applet

[ironfoot]

@Timothy_Hayes

I wonder if it has something to do with them being snaps rather than debs.

A likely reason, because the snap infrastructure provides an extra isolation level. So, the problem narrows down to "MPRIS with snaps".
It will be faster to install vlc and firefox as .deb packages.

Some issues with Firefox and Snap on version 24.04

Hi, @xuraax! Ironically, not using snaps may be the easiest solution. If you don't need snap support in general, Firefox is available as a binary or a .deb package.