It seems that the reports of Firefox’s vulnerability have been greatly exaggerated.  The javascript vulnerability is an old flaw, that is well known, and nobody as yet has managed to use it to successfully run code.  Ars Technica has more on information on the story.
“Mozilla has been able to reproduce a DoS issue based on the information, according to a new post on the Mozilla Developer Center. So far, they have yet to determine whether code execution is a possibility, but say they are “still investigating” and promise updates as necessary. Nevertheless, it’s beginning to look as though this was largely a prank.

Mischa Spiegelmock has now said that the talk “was to be humorous,” and that the presentation covered a “previously known Firefox vulnerability that could result in a stack overflow ending up in remote code execution.” In other words, they didn’t discover a new flaw.”

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