[eurticket]

I would suggest just having the tab muted by default, and maybe an easier button to toggle on/off, than current right-click, to unmute/solo. Perhaps, a limited notification for the first 100 times your tab is muted and it detects sound being played in the tab, so you're not wondering why no sound is playing.

[oftenwrong]

Something like this:

https://addons.mozilla.org/en-US/firefox/addon/mute-sites-by...