Firefox is a great tool for affiliate marketers, which can be made even more useful through the use of these must-have 
extensions.
1. Web deveveloper
The Web Developer extension adds some very useful tools to your Firefox browser window, including cookie information and other validation menus. I find the CSS tools most useful for troubleshooting and coding CSS.
2. SEOQuake
Absolutely essential, this extension adds useful SEO information to your browser, such as pagerank, incoming links and allows you to save them for comparison purposes.
3. Screen Grab
This extension allows you to easily capture parts of the Firefox screen. I find it exceptionally useful for grabbing excerpts to use in posts and affiliate sites.
4. Alexa Sparky
Yes, Alexa can make something useful. Alexa Sparky allows you to track trends and compare the current sites reach and rank.
5. Colorzilla
Exceptionally simple plugin that allows you to grab colors from the current page, browse colors and also measure distances – time-saving extension.
If you are not already using Firefox, I highly recommend grabbing a copy.
Suggestions? Ideas? Feedback? Please leave a comment!
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Thanks, I also recommend checking out Linkchecker and IETab, both also very useful.
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The first extension I install after installing Firefox on a computer is Firebug. The ultimate extension for any web developer.