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Comment by fosap | Hacker News Reader

I hope referrals will be disabled anytime soon. Firefox has AFAIK disable referrals to other domains by default.

In the case of Javascript hotlinking, that'll do approximately diddly squat though.

  if(/whatispolymath/.exec(location.href)) alert("...");

Or better yet, test if it's not your domain, then show a message.

That is a way better, IMO.