As I said before, this happens in the Windows version of Mozilla too. It's a Mozilla problem, not Mac or vBulletin.
I wouldn't be so smug about the "inherent" security of Mozilla either. A flaw has been found in Windows versions of Mozilla and Firefox that allows malicious Web sites to run arbitrary code on the user's machine. If you haven't upgraded to Mozilla 1.7.1 or Firefox 0.9.2, now would be a good time.
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