Said I hadn't visited any of the sites, except HN (which is easy to guess since news.ycombinator.com will be in the HTTP_REFERER field...). If I re-run the tes

Said I hadn't visited any of the sites, except HN (which is easy to guess since news.ycombinator.com will be in the HTTP_REFERER field...). If I re-run the test it still gets some sites wrong (says I haven't visited them when in fact I have). It even claims I haven't visited Amazon both times when in fact it's open in another tab.