Whitefox:
Every browser has its strengths and weaknesses. For research, go to US-CERT, Secunia, etc. to do research on published browser exploits. Microsoft's Internet Explorer is a joke when it comes to security and so too is Microsoft Windows. FireFox can be configured in such a way that makes it more secure than IE, but the same can be said of IE. Locking down and restricting specific features such as Flash, Shockwave, ActiveX, JAVA, etc. will increase security at the cost of less functionality. Still, getting at the source code and buying the latest Mozilla FireFox books (
http://search.barnesandnoble.com/boo...rid=pv4drFBB1B) can arm you with the knowledge to secure the browser quite nicely. I'm not saying that FireFox is the most secure browser, but it has key advantages in my humble opinion to assist you in your mission to make it one of the most secure browsers possible.
Don't forget other aspects of computer security: physical and a security policy. Firewalls, both hardware with NAT/SPI protection and configurable port locking and software such as ZoneAlarm PRO (Windows) and a FreeBSD Firewall (BSD, Linux), can help greatly. Taking off critical data from your computer environment (user ids, passphrases, sensitive work documents, etc.) reduces your threat from having your most critical data compromised because to you, that's your crown jewels. Managing removable data securely presents its own challenges as well so get a safety deposit box at a bank for that. Backing up your data is also critical: no backups = no safety net. CD-R/RW and DVD +/-R/RW media is cheap, accessible, and affordable, but tape backups are best for long term archival purposes. Then, there is RAID 0-5 for data redundancy and fault protection which merits considerable attention in a well defined security policy. Most people don't go this far, but they ought to if they rely on computers for their livelihood.
When I build my first desktop PC this Christmas 2005, I will incorporate these ideas because I can't afford to lose important data anymore. I myself greatly prefer Mozilla FireFox because of its open source, free aspects. That in of itself helps me to buy books on the browser so I can modify the source code to make it meet my security (insane levels) needs.