Security Update: The following list of security issues have been fixed.
MFSA 2007-09 Privilege escalation by setting img.src to javascript: URI
MFSA 2007-08 onUnload + document.write() memory corruption
MFSA 2007-07 Embedded nulls in location.hostname confuse same-domain checks
MFSA 2007-06 Mozilla Network Security Services (NSS) SSLv2 buffer overflow
MFSA 2007-05 XSS and local file access by opening blocked popups
MFSA 2007-04 Spoofing using custom cursor and CSS3 hotspot
MFSA 2007-03 Information disclosure through cache collisions
MFSA 2007-02 Improvements to help protect against Cross-Site Scripting attacks
MFSA 2007-01 Crashes with evidence of memory corruption (rv:1.8.0.10/1.8.1.2)

Windows Vista Support: Many enhancements and fixes for Windows Vista are included along with the following caveats.

New Languages: Beta releases for several new languages are now available for testing.
Afrikaans (af), Belarusian (be), Georgian (ka), Kurdish (ku)

Permissions Bug Fixed: In the German (de) locale on Windows and Linux, resolved a problem with certain files tagged as read-only.