Mozilla has released version 1.5.0.7 of Firefox, fixing several security issues and bugs. The one for Win32 can be downloaded from the official FTP, and those for other languages and OS - from here. Firefox 1.5.0.7 should be available through "update check" soon.

MFSA 2006-64 Crashes with evidence of memory corruption (rv:1.8.0.7)
MFSA 2006-62 Popup-blocker cross-site scripting (XSS)
MFSA 2006-61 Frame spoofing using document.open()
MFSA 2006-60 RSA Signature Forgery
MFSA 2006-59 Concurrency-related vulnerability
MFSA 2006-58 Auto-Update compromise through DNS and SSL spoofing
MFSA 2006-57 JavaScript Regular Expression Heap Corruption