Yeah, I'd noticed this a while ago. It's actually pretty nice if you've told Firefox to ask you about cookies first. I find that if the top site in the search results tries to set a cookie, it's often also one of those times that it's worth skipping to the second.
What's interesting about this is that it won't so much help spy on you (it won't), as tell people how effective their search engine optimization is (prefetch requests where referrer=Google mean you hit the top on something). I would expect it would make it slightly harder (one more hoop) to spy on you, because getting the cookie does not necessarily imply that you clicked the link.
What's interesting about this is that it won't so much help spy on you (it won't), as tell people how effective their search engine optimization is (prefetch requests where referrer=Google mean you hit the top on something). I would expect it would make it slightly harder (one more hoop) to spy on you, because getting the cookie does not necessarily imply that you clicked the link.