just in case one wonders where is the latest URL
http://www.mozilla.com/en-US/firefox/3.0b4/releasenotes/
Interesting development are in  the work  there, check what they say about security, i am qouting from the URL above.

More Secure
One-click site info: Click the site favicon in the location bar to see who owns the site and to check if your connection is protected from eavesdropping. Identity verification is prominently displayed and easier to understand. When a site uses Extended Validation (EV) SSL certificates, the site favicon button will turn green and show the name of the company you're connected to.
Malware Protection: malware protection warns users when they arrive at sites which are known to install viruses, spyware, trojans or other malware.
 
New Web Forgery Protection page: the content of pages suspected as web forgeries is no longer shown.
 
New SSL error pages: clearer and stricter error pages are used when Firefox encounters an invalid SSL certificate.

Add-ons and Plugin version check: Firefox now automatically checks add-on and plugin versions and will disable older, insecure versions.

Secure add-on updates: to improve add-on update security, add-ons that provide updates in an insecure manner will be disabled.

Anti-virus integration: Firefox will inform anti-virus software when downloading executables.

Vista Parental Controls: Firefox now respects the Vista system-wide parental control setting for disabling file downloads.
Effective top-level domain (eTLD) service better restricts cookies and other restricted content to a single domain.
Better protection against cross-site JSON data leaks.

Shawal,

thanks for the link and snippet, looks like Firefox will start protecting against a lot of things out the box with extra features so you don't need a laundry list of add-ons. Should make setting up 'regular' users PC's simpler.

I'm with iSmith though as I'll wait for the stable release, looking good.