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If you were using Chrome, my extension MuteTab (http://www.mutetab.com/ http://www.mutetab.com/) could help. It shows which tabs are playing HTML5 audio/video
by jaredsohn 14y ago
If you were using Chrome, my extension MuteTab (http://www.mutetab.com/ http://www.mutetab.com/) could help. It shows which tabs are playing HTML5 audio/video or have other plug-ins such as Flash. Unfortunately, it just provides a list and cannot tell you for certain if a tab is playing sound or not. (It could in theory indicate if HTML5 video/audio, some Flash sites such as YouTube, and QuickTime were playing sound, but I haven't implemented that portion at this time.)