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I've had the same problem a few months ago: it's due to a buggy Firefox extension that breaks its behavior, but I can't remember precisely which one it was (it might be the TabBrowsing extension).
After checking your site: I guess I'm right, coz my own firefox (1.0.1) is correctly redirected. So, if it doesn't work with yours, then it's because of your browser, not of your server.
skalpa.>