The release is called security update 1.0.1 and is available from their site.
http://www.mozilla.org/
I read about it here,The update covers a handful of security vulnerabilities and approximately 40 other fixes related to browser performance based on user feedback to Mozilla. The security vulnerabilities range from "moderately critical" in nature to not critical. None of them are highly critical, and there are no known exploits for any of the vulnerabilities.
http://informationweek.com/story/showAr ... D=60403364