From an administrator account, start Firefox > Help > Check for Updates.
Or download: http://www.mozilla.com/firefox/all.html
"Release Date: July 30, 2007
Security Update: The following security issues have been fixed:
MFSA 2007-27 Unescaped URIs passed to external programs
MFSA 2007-26 Privilege escalation through chrome-loaded about:blank windows"
Mon, Jul 30 2007 23:08