Firefox hacker withdraws zero-day claim

A hacker who claimed to have found a serious zero-day bug in Firefox on Saturday now says he was never able to exploit the supposed vulnerability to hijack computers.

Mischa Spiegelmock and Andrew Wbeelsoi claimed that Firefox was critically flawed in the way it handles JavaScript. But Spiegelmock has withdrawed those claims.  In a statement  provided to Mozilla, Spiegelmock said that the computer code displayed during the presentation does not fully compromise a PC running the browser.

"I have not succeeded in making this code do anything more than cause a crash and eat up system resources, and I certainly haven't used it to take over anyone else's computer and execute arbitrary code," he wrote in the statement.