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by Someone 4700 days ago
For those, like me, wondering why that 'detect visited' hack doesn't simply bolden visited links or changes its font or font size and uses getComputedStyle or getBoundingClientRect [1] to see whether that changes the bounds of the element: that trick has been mitigated three years ago. See http://hacks.mozilla.org/2010/03/privacy-related-changes-com....

[1] not explicitly mentioned there, but I think the solution described intends to plug that hole, too.