[wardenclyffe]

You have the ability right now, go to your settings and switch your cookie handling to "prompt me for all cookies", and tada! you are now in control.

It's a pain I admit, but such is the burden of maintaining your privacy online. Whenever I set up a computer for friends or family I always do this (as well as blocking flash and javascript as standard) and explain what it entails, because without that they cannot know what they are giving away.