Mozilla Corp. has produced a patch for yet another critical flaw in Firefox, the latest embarrassment in a lengthening list this month for the open-source browser.

Tuesday, security researchers Billy "BK" Rios of VeriSign Inc. and Nathan McFeters of Ernst & Young, posted proof-of-concept code that exploited another URL protocol-handling bug in the Firefox and Netscape browsers.

By Thursday morning, Firefox developers had wrapped up a fix for the newest vulnerability. An automatic update to users, however, has not yet been scheduled.

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