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Firefox Updated With Critical Security Fix

Mozilla Corp. on Tuesday released a patch for a zero-day critical security hole in Firefox that could be exploited to crash the browser or install malicious code.

Firefox fixes a zero-day vulnerability, which first appeared April 18 on Mozilla's Bugzilla listing. The flaw was found in Firefox, an update of the open-source browser that was released in mid-April.

Someone using malformed JavaScript code could use the bug to crash the browser, security officials said. JavaScript-based flaws are not uncommon with Firefox or its rival Internet Explorer from Microsoft Corp. Some of the 24 bugs fixed in the release of Firefox were related to JavaScript.