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Interesting. Wikipedia references two add-ons written back in 2007 for this purpose. No idea if they still work on more recent versions of FF.

http://en.wikipedia.org/wiki/HTTP_ETag#Tracking_using_ETags

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The writeup about the two extensions for firefox is wrong, those two were meant to block the trick where you can determine if a user has visited a specific site/page by looking at the link color/state.

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