Quote:

This article isn't about annoying auto-playing videos. You know that Firefox displays a speaker icon on tabs which are playing audio and that you can mute those easily with a right-click on the tab and the selection of mute tab from the menu, or a click on the audio icon directly.

But, what if you have a lot of tabs open and can't spot the icon in the current view? It happens that media tabs can become hidden in the background if you happen to open more than a dozen or so tabs.

You could try using an add-on like Auto Mute Plus to silence all the tabs, and then search for the one which played the audio. Or you could hit the mute key on your keyboard too or turn down the volume.

Is that really a solution though? There is still the problem of finding the tab. Unfortunately, there is no feature for this task in Firefox at the moment, not even one that you could enable from about:config. Add-ons do come to the rescue.

Tip: You can configure Firefox to mute all tabs by default, and mute individual sites as well. Chrome users can check out the complete Chrome muting guide.