Chrome natively shows audio indicators for music playing tabs in its browser, Firefox users miss this feature, fortunately, Noise Control add-on now shows audio indicators for HTML5 video or audio playing tabs in the Firefox browser. You can also mute such video by clicking on the icon in that tab.
Noise Control adds Per-tab Audio indicators to Firefox with Click-to-mute functionality
Yesterday released Firefox 37 plays most videos on YouTube with HTML5 video player by default and this extension also “shows an icon when a plugin (such as Flash) is active on a page, because there’s no way to tell if a plugin is making noise.”
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