<< One of the speakers at a Toorcon security conference session last weekend has admitted that claims he and an accomplice made regarding an "unfixable" flaw in Firefox, and a video of the two purportedly exploiting this flaw, were a not-so-elaborate hoax. >>

via BetaNews:
http://www.betanews.com/article/Firefox_Flaw_a_Hoax_Admits_Speaker/1159903320

the apologizing:
http://developer.mozilla.org/devnews/index.php/2006/10/02/update-possible-vulnerability-reported-at-toorcon/