Firefox has a feature where if a tab is playing audio, the favicon transforms into a sound icon. Yes, good, helpful.

However if you *click* on the sound icon, that mutes the tab. I ONLY ever do this by accident. The tabs aren't very wide and have* no clear dividing lines between each other, so it's hard to precisely hit the bit of tab that isn't a mute button, and also sometimes it doesn't turn into a sound icon/mute button until I've started clicking.

Is there a way to disable this "feature"?