Well looks like the black hatters don't have long to brag about their big find in FF.

http://forums.mozillazine.org/viewtopic.php?t=469982

Some JS bug fixes in and a new bug raised over the claims;

https://bugzilla.mozilla.org/show_bug.cgi?id=355069

Shows they have managed to recreate the flaw.

I personally think if you found such a serious flaw and planned to use to for gain (personal network for black hatters for example) then you wouldn't brag about it!  I think it's a personal PR stunt.