Mozilla has released new versions of Firefox and the Suite to fix several security vulnerabilies, including the Java Script engine flaw.

Mozilla Firefox 1.0.3 released for several security issues
http://www.eweek.com/article2/0,1759,1787270,00.asp

Users who are upgrading from prior versions of Firefox or the Mozilla Suite should uninstall and reload according to the “Clean Installation“ instructions link below.  This will ensure existing bookmarks and settings are preseved in the Mozilla profile folders.  

Mozilla Home Page - Download Links for new versions 
http://www.mozilla.org/

Instructions for the "Clean Installation" process to remove older versions
http://forums.mozillazine.org/viewtopic.php?t=251238