I too know the websites you visited
I think it got 100% for me, on Safari/Mac.<p>Note that it doesn't need to be 100% accurate to be effective. If it guesses better than 50% (i.e. coin flip), then it could be used to give guesses with at least some confidence. No different than analyzing any other noisy dataset. Because this all works client-side, it can also be done quite invisibly.