1. Firefox
1.1. Pros
1.1.1. Wide range of plug-ins and customization options
1.1.2. Ability to sync your bookmarks on any computer
1.2. Cons
1.2.1. No thumbnail preview
1.2.2. Attracts virus and malware writers
2. Internet Explorer
2.1. Pros
2.1.1. Better at installing downloaded software
2.1.2. Integrates nicely with all MS Office products which other browsers do not do as well
2.2. Cons
2.2.1. Does not offer built in spell checking
2.2.2. Is the default of Windows
3. Opera
3.1. Pros
3.1.1. Very few virus vulnerabilities
3.1.2. Quickfind searching, thumbnail programs, mouse gestures and interactive voice function
3.2. Cons
3.2.1. Frequent conflicts with Web sites and compatibility issues
3.2.2. Extension gallery not as extensive as Firefox's or Chrome's.
4. Safari
4.1. Pros
4.1.1. Captures and sends less of your data than other major browsers
4.1.2. "Reader" view cuts all the ads and unnecessary items off a page
4.2. Cons
4.2.1. A lack of private browsing and anti-phishing features
4.2.2. Not very customizable
5. Chrome
5.1. Pros
5.1.1. Chrome's higher speed can make you more productive
5.1.2. Hard to crash completely
5.2. Cons
5.2.1. Graphics hardware acceleration doesn't work with all graphics cards
5.2.2. Limited functionality and plug-ins