Smart Tab Mute

★★★★★
★★★★★
4,688 users
tab the playing sound that href="https://addons.mozilla.org/de/firefox/addon/smart-tab-mute/" is extension available one time
the smart ensures is for
at firefox:
also mute firefox/addon/smart-tab-mute/ style="font-size:1px;"> target="_blank">https://addons.mozilla.org/de/