Firefox 2.0.0.10 has been released. This is a security update which fixes the issues listed below.
MFSA 2007-39{.high} Referer-spoofing via window.location race condition
MFSA 2007-38{.high} Memory corruption vulnerabilities (rv:1.8.1.10)
MFSA 2007-37{.high} jar: URI scheme XSS hazard
Firefox will automatically update itself to the latest version but if it does not you can download the latest version from the Firefox homepage. My Firefox is up2date, is yours?
Source: Mozilla Developer News