Kashmir Hill’s recent column on history sniffing not only got a response from YouPorn, but it seems to have resulted in YouPorn being sued when users became aware of what had been occurring. She writes:
The practice works through checking whether your browser registers certain links as previously visited, by seeing if they are assigned the color “purple” — that nifty change of color that tells you that you’ve already clicked on a link. I exposed YouPorn’s exploitation of the security flaw here last week, based on an academic paper published a few months back.
Since I published the article on YouPorn’s sniffing on Nov. 30, YouPorn quietly removed the history-sniffing code from its website. So at least for now, amateur porn lovers’ browser histories are safe.