[squeaky-clean]

But you can only change the volume of the entire browser, not specific tabs. If you're playing music in another tab, you can't just turn down one tab.

[willhinsa]

You can mute single tabs in Chrome easily:

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."