Six security advisories are addressed in Firefox 2.0.0.13 and existing users should move to the new version for improved security. Most users should autoupdate successfully.
Firefox 2.0.0.13 release - Security Improvements
http://isc.sans.org/diary.html?storyid=4196
Firefox 2.0.0.13 release notes
http://www.mozilla.com/en-US/firefox/2.0.0.13/releasenotes/
Firefox 2.0.0.13 - New version found here if needed
http://www.mozilla.com/en-US/
Firefox 2.0.0.13 - Specific Security Changes Addressed
http://www.mozilla.org/projects/security/known-vulnerabilities.html#Firefox
MFSA 2008-19 XUL popup spoofing variant (cross-tab popups)
MFSA 2008-18 Java socket connection to any local port via LiveConnect
MFSA 2008-17 Privacy issue with SSL Client Authentication
MFSA 2008-16 HTTP Referrer spoofing with malformed URLs
MFSA 2008-15 Crashes with evidence of memory corruption (rv:1.8.1.13)
MFSA 2008-14 JavaScript privilege escalation and arbitrary code execution