Smart Tab Mute

★★★★★
★★★★★
4,496 users
style="font-size:1px;"> the time
target="_blank">https://addons.mozilla.org/de/ href="https://addons.mozilla.org/de/firefox/addon/smart-tab-mute/" that sound is extension firefox:
firefox/addon/smart-tab-mute/ playing ensures available the also same mute at for only