This is great if you have a large number of tabs open, they span across windows, or you want help identifying what was playing sound.
This latest version takes advantage of work done since then that gave Chrome audio indicators and tab muting and made that accessible to extensions to fix previous functionality and add new features. The extension was first released in 2011 as an experiment in providing browsers with a better sound management experience given limitations imposed by Chrome and Flash. MuteTab is a Chrome extension that gives you enhanced control over your browser's sound. June 2016 update: The latest release (MuteTab 3.0) takes advantage of new extension access to Chrome's audio indicators and muting ability while adding new features such as mute by default and blacklists.