MuteTab

Developer's DescriptionBy MuteTabHelps narrow down which tab that sound is coming from--browser-wide granular mute controls, automatically mute background tabs.MuteTab is a Chrome extension that helps you manage the sound coming from tabs in Google Chrome. It helps you to find which tab(s) are making sounds and provides browser-wide management of tab muting (calling JavaScript functions where available, otherwise hiding it from the page), including automatically muting all background tabs.