tomek3001 said Ok, I can disable media keys in Firefox, but it only stopped them from playing sound

tomek3001 said

Ok, I can disable media keys in Firefox, but it only stopped them from playing sound in random tab. Keys still do not work properly. Instead of managing my Spotify music playback, wthey do nothing at all. What else can I do? (yes, I have restarted Firefox after applying changes)

Having the same problem. Did as suggested and now my hotkeys simply do nothing at all while Firefox is in focus. Wondering if it's a Windows issue after all, although I haven't had any system updates recently enough to explain it.