[tmcdonald]

I was under the impression that attempts had been made to hide any effects of :visited styles on the accessible DOM to stop this from working. There's a particularly good article on Mozilla's attempts [1], and the relevant bug on Bugzilla. [2]

[1]: http://dbaron.org/mozilla/visited-privacy

[2]: https://bugzilla.mozilla.org/show_bug.cgi?id=147777