the windows built in firewall????
and still, firefox is too vulnerable, read this article.
The head of threat intelligence at Symantec argues that Mac OS X and Mozilla Firefox users are fooling themselves if they think they’re impervious to attack. Out of 38 vulnerabilities discovered in the first half of 2005, 25 were for Mozilla browsers and only 13 for Internet Explorer. Recent trojan discoveries demonstrate that as OS X increases in popularity, it will get more attention from potential attackers. The Register has the full story.
http://www.theregister.co.uk/2005/0...c_threat_report