The new Chrome extension does he right things: Mute Tabs.
Mute Tabs looks on to all your open tabs for the audio violator, and puts a musical icon on it, makes an easy visual aid. It might not work with every html plugin, but believe me, it can tag the tab almost all the time.
All sounds in modern browsers such as Chrome are made by plug-ins such as Flash, Silverlight, QuickTime, etc. (expressed in HTML as <object> or <embed>), Java applets (<applet>), or HTML5 audio/video (<audio>, <video>). The extension scans open webpages for these tags. If configured, webpages that include any of these tags that are making sound will have their tab icon changed to the MuteTab icon (
More on how Mute Tabs works
Firefox users can be satisfied with BarTab. BarTab can load or unload any or all tabs, while keeping their spots in the browser. Its still better than force quit or crash, Firefox can start with all tabs unloaded except for the one you’re on, restarts are silent.
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