Oh, now YouPorn knows I've been visiting PornHub too. So much valuable info! Too bad I use them both just to look at chicks being banged.

Seriously though, I'd like to see what the other 45 websites are and what they do, but the PDF linked 404's. And I reckon this is the getComputedStyle approach, and that was, AFAIK, fixed. The new ways of exploiting the styled :visited links are going to require more work.