I found a chrome extension a few months ago that does a lot of this. It's called MuteTab and bills itself as 'browser-wide granular sound management for chrome'

I found a chrome extension a few months ago that does a lot of this. It's called MuteTab and bills itself as 'browser-wide granular sound management for chrome'. It's not perfect with flash, but makes a huge difference. http://www.mutetab.com/ http://www.mutetab.com/ EDIT: here's the github - https://github.com/PhilGrayson/MuteTabs https://github.com/PhilGrayson/MuteTabs