I really hate how everyone's misrepresenting the ad blocker thing. Google isn't blocking ad blockers. Google is locking down a function that a lot of extensions use, and some of those extensions are ad blockers. The purpose is to combat unauthorized scripts screwing with websites to do malicious things; the fact that authorized scripts are also restricted is a side effect, not the goal. It's a side effect that they surely aren't losing much sleep over, to be fair. But they're not going out of their way to combat ad blockers, and other ad blocking techniques like the one used by AdBlock Plus will continue to function just fine.