Semi-OT: I'm one of these guys with ~200 tabs open spread over 5 different Chrome user profiles (work plus one session per Twitter account, as I can't stand Tweetdeck or any other app). Once an hour some tab, usually it's Twitter or a specific newspaper, will run amok in the background and run up to 100% CPU usage until I manage to launch the Chrome Task Manager and kill the offending tab (group, sometimes).

Is there any way to force Chrome to totally inactivate all tabs in the background, with a whitelist option so Youtube and friends can run?