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updated 3/14/2011 2:14:10 PM ET 2011-03-14T18:14:10

A serious flaw targeting the popular Mozilla Firefox Web browser has been fixed.

Labeled “critical” on the Mozilla Security Blog, the vulnerability was used by hackers to trick the user into visiting a “specially crafted site” which then infected the user’s system with malware that could corrupt or crash the computer. The flaw affected Firefox versions 3.5 and 3.6.

The Firefox bug was first found on the Nobel Peace Prize website; that site was blocked by Firefox. Just after 8:00 PM on Oct. 27, Firefox released a patch for the security flaw.

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