Must-have Firefox extensions for Web Developers

thecssweblog has a list of 9 Firefox extensions that anyone who works with web technology should check out. Some you might have heard of already, others you might not.
loadaveragezero also has a list of their own.

Here are the extensions that make it to my list:

1. Web Developer - The absolute must-have extension for anyone who builds web sites, no matter how small or few and far between.
2. FireBug - Not your grandma's Javascript console! A much more versatile replacement for the built-in console.
3. Greasemonkey - Lets you add bits of Javascript to any web page. In much the same way that user CSS lets you take control of a web page's style, user scripts let you easily control any aspect of a web page's behavior.
4. Platypus - Works well together with Greasemonkey. The author calls this Firefox extension "active browsing." In effect, it allows non-programmers to interactively alter a Web page, and then save the changes as a Greasemonkey script so the next time you visit the page your changes stick.
4. IE View - Check all the nasty IE bug from within Firefox.
5. LiveHTTPHeaders - It's kinda like Fiddler, it tracks all the HTTP request/response route that happens when you visit a site.
6. Piggy Bank - Just for fun (or not), a glimpse of the future "Semantic Web" browser that lets you take informations found on the web and display it the way you want it.
7. Google PageRank - A nice little extension that displays Google PageRank neatly inside your status bar. Very useful if you don't want to install the entire Google Toolbar just to see PageRanks.

I don't have EditCSS, MeasureIt, CookieCrumbler and Clear Cache Button up there simply because the same functionalities exist in the Web Developer extension, no need to crowd the space.
ColorZilla is not up there as well because I think a desktop app is more suitable for the task.
DevBoi is also a very interesting extension that offers easy access to web-dev documentations, but I just thought the docs are more useful living in your IDE/editor.

Let me know if you think there's a must-have extensions I gotta have on my list.

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