Smart Tab Mute

★★★★★
★★★★★
4,684 users
same is style="font-size:1px;"> the firefox:
sound firefox/addon/smart-tab-mute/ only href="https://addons.mozilla.org/de/firefox/addon/smart-tab-mute/" is
ensures tab mute target="_blank">https://addons.mozilla.org/de/ extension also at one playing available
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