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The countermeasure is trivial: single-origin policy or origin managmment for cache access. At a slightly expense of slower browsing when visiting evil websites.

Countermeasures don't appear to be all that necessary, if the attack itself is ineffective. The results seem to be quite random, placing me at sites I've never been on and not noticing ones that I do visit regularly, such as Twitter and Facebook.

Install RequestPolicy. It fixes this problem and many many more.

Didn't work in Firefox 8.0.1

I'm getting almost random results in FF8. It differs quite a lot when comparing multiple runs.

I'm more surprised that it thinks that I've logged into blogger (which I've never done on this computer) than that it misses my one-page visit to reddit about a week ago. And on the next round the results are reversed.

Try the original: http://lcamtuf.coredump.cx/cachetime/orig.html

It worked for me on Chrome. The one linked now gives some weird entries.

Still doesn't push through noscript.