I like the idea, but is there really no way to mute the audio? Sadly I did not finish the article because of that.
There are so many ways to mute my computer, I wouldn't even know how to list them all. But on top of the list I would start with the volume keys on the keyboard and then with the volume panel in the menubar and then with the audio panel of the system preferences. Towards the far end of the list I would cut the wires to the speakers.
http://fieldguide.gizmodo.com/mute-noisy-tabs-in-google-chro...
Type this in to the address bar: chrome://flags/#enable-tab-audio-muting
Then click Enable under "Enable tab audio muting UI control."
chrome://flags/#enable-tab-audio-muting