This. I don't really have the conscience to block the only source of revenue a webpage might have. But it's the Flash ads that make my otherwise silent 2009 Mac

This. I don't really have the conscience to block the only source of revenue a webpage might have. But it's the Flash ads that make my otherwise silent 2009 Macbook Pro 17" (w/ SSD drive) roar like a 747 taking off, and that's where I draw the line. So I use FlashBlock and I'm fine. I think Google Ads (and in fact most ad providers) can detect this and display non-Flash ads instead.