An anonymous reader writes: Mozilla is working on identifying Firefox tabs that are currently playing audio. The feature will show an icon if a tab is making sounds and let the user mute the playback. It’s worth noting that while Chrome has had audio indicators for more than a year now, it still doesn’t let you easily mute tabs. The option is available in Google’s browser, but it’s not enabled by default (you have to turn on the #enable-tab-audio-muting flag in chrome://flags/).
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