A new Firefox update was released this afternoon that fixes some pretty serious security issues.
MFSA 2007-25
XPCNativeWrapper pollution
MFSA 2007-24
Unauthorized access to wyciwyg:// documents
MFSA 2007-23
Remote code execution by launching Firefox from Internet Explorer
MFSA 2007-22
File type confusion due to %00 in name
MFSA 2007-21
Privilege escalation using an event handler attached to an element not in the document
MFSA 2007-20
Frame spoofing while window is loading
MFSA 2007-19
XSS using addEventListener and setTimeout
MFSA 2007-18
Crashes with evidence of memory corruption
No matter how bad they were they are fixed now and I have to admit it would take a lot for me to move away from this wonderful browser. Get it now!