web browser mute thingie -- lets you stop/pause/close potentially noisy tabs
http://www.mutetab.com/ via http://gizmodo.com/5826545/mutetab-lets-you-know-which-chrome-tab-is-making-that-racket
(helpful if like me at work you're not able to install the new Chrome beta (http://chrome.blogspot.ca/2013/11/track-down-those-noisy-tabs.html).)
MuteTab: (http://i.imgur.com/tm7JfVw.jpg)
http://www.mutetab.com/mutetabfaq.html