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Mozilla/Foxfire - Insecure Java Plugin in Firefox
Mozilla is disabling older versions of the Java Deployment Toolkit plugin for Firefox users, in a bid to block attacks against a newly-discovered Java security hole that attackers have been exploiting of late to install malicious code.
Please read the rest of the story Mozilla Disables Insecure Java Plugin in Firefox — Krebs on Security
And more info here for both IE and FF users http://www.kb.cert.org/vuls/id/886582