Firefox 2.0.0.13 has just been released. It fixes a few security issues.
XUL popup spoofing variant (cross-tab popups)
Java socket connection to any local port via LiveConnect 2008-17
Privacy issue with SSL Client Authentication
HTTP Referrer spoofing with malformed URLs
Crashes with evidence of memory corruption (rv:1.8.1.13)
JavaScript privilege escalation and arbitrary code execution
If the auto update does not work for you, download the latest Firefox.
Source: Mozilla | Mozilla Security Advisories