1. Fire Fox
1.1. Pros.
1.1.1. Fastest browser when it comes to download speed
1.1.2. Has some advanced security measures that protect your computer from spyware and even certain viruses
1.2. Cons.
1.2.1. Takes a lot of memory to run
1.2.2. Some websites do not show properly in Firefox®, and require you to view them with IE
2. Opera 9
2.1. Pros.
2.1.1. Opera's browser is light-weight and well-built
2.1.2. As far as speed and security, Opera, like any browser has these issues as a top priority and continually improves these areas
2.2. Cons.
2.2.1. IE is integrated with the operating system
2.2.2. Opera is simply different compared to other web browsers
3. Google Chrome
3.1. Pros.
3.1.1. It won't crash
3.1.2. It's really fast
3.2. Cons.
3.2.1. You lose some history power
3.2.2. It's only in its first beta
4. Internet Explorer
4.1. Pros.
4.1.1. Speedy browser for high majority of sites
4.1.2. Only browser that works with Windows Updates
4.2. Cons.
4.2.1. No tabbed browsing
4.2.2. Mac development has CEASED - no cross-platform solution since IE 5
5. Apple Safari
5.1. Pros.
5.1.1. User style sheets
5.1.2. Doesn't have the kinds of security problems that plague IE on Windows
5.2. Cons.
5.2.1. RSS feature not yet available
5.2.2. Has web developer tools implemented via JavaScript Bookmarklets, but poorly organzied and difficult to use compared with Firefox's similar web developer extension