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Mozilla Firefox If you don’t already, start using Firefox as your main browser now. I’m serious… you owe it to yourself.
Firebug Must have for any serious Web 2.0 Javascript developer. The AJAX debugging capabilities are simply priceless.
Web Developer Toolbar Very handy toolbar for Firefox that sits right below your address bar. I use it mostly to view CSS, validate the page I’m working on and enable/disable JavaScript or images.
Drag de Go You need this extension! Once you get used to it, vanilla Firefox (or any other browser for that matter) will become painful to use! The most useful extension ever.
JavaScript Code Improver Invaluable, especially for those who, like me, are into reversing other people’s compressed and obfuscated code 
JSLint JavaScript static analyzer by Douglas Crockford. Some people love it, some people hate it. I think it’s an OK tool to have handy.
HTML Validator Powered by Tidy, HTML Validator is a great Firefox extension for XHTML and CSS validation freaks like me. You know who you are.
Dojo ShrinkSafe Keep this in your toolbox and use it whenever you need to shave a few KBs from your JavaScript files.
JSEclipse This Eclipse plugin makes JavaScript development a breeze. Syntax highlighting, code completion, real-time error checking. The best IDE for JavaScript out there, bar none.
IE View Firefox extension that add an “Open in Internet Explorer” button to your toolbar and to the contextual right-click menu. Useful when you need to switch back and forth to fix those nasty IE bugs.
SEO For FireFox Want to know why Google or Yahoo! ranks pages? If so this is the Firefox extension for you. SEO for Firefox pulls in many useful marketing data points to make it easy get a more holistic view of the competitive landscape of a market right from the search results.
Aptana Aptana is a robust, JavaScript-focused IDE for building dynamic web applications.
MeasureIt Draw a ruler across any webpage to check the width, height, or alignment of page elements in pixels.
ColorZilla With ColorZilla you can get a color reading from any point in your browser, quickly adjust this color and paste it into another program. You can Zoom the page you are viewing and measure distances between any two points on the page. The built-in palette browser allows choosing colors from pre-defined color sets and saving the most used colors in custom palettes. DOM spying features allow getting various information about DOM elements quickly and easily.
EditCSS The Editcss project ought to be an easy way for web developpers to edit and modify currently loaded stylesheets. It's an extension based on a wonderfull bookmarklet created by Jesse Ruderman : Edit styles and displays the code into a sidebar under Mozilla Firefox.
Cookie Crumbler Are you a developer who has to clear cookies from certain domains over and over again for testing purposes? Clearing all cookies is fast but you lose ones you may not want to. Scrolling through Firefox's cookie manager takes too long when you're doing it 50 times a day. This extension allows you to configure a list of domains and cookie names that you can then delete with the click of a button located on your status bar.
Aardvark The Aardvark Firefox extension is a tool for web developers/designers as well as casual users.
Clear Cache Button Adds a clear cache toolbar button. After installing the extension, find the clear cache button in the toolbar customization panel.
Screen grab! Screengrab saves entire webpages as images.
View formatted source Displays formatted and color-coded source and optional CSS information for each element.
View Source Chart- Creates a Colorful Chart of a Webpage's Rendered Source Code
- Displays Source in its Altered State After the DOM has been Manipulated by JavaScript
Fangs Screen Reader Emulator Renders a text version of a web page similar to screen reader output. Helps developers find accessibility issues fast.
Add N Edit Cookies Cookie Editor that allows you add and edit "session" and saved cookies.
UrlParams Shows you the GET and POST parameters of the current website in the sidebar.
You can alter their values, add new parameters, switch get/post and more.
Codetch Get the feel of Dreamweaver in a Firefox extension. Edit your documents right next to your web pages as you surf.
Server Switcher Server Switcher is a navigational help tool for web developers. It allows you to easily switch between sites on your development and live servers, so that you can immediately see the differences.
Adsense Preview Preview the Google ads that may show on any web page.
Yet Another Window Resizer Resize browser window to default screen resolutions.
Server Spy Server Spy indicates what brand of HTTP server (eg. Apache, IIS, etc.) runs on the visited sites. When a tab is selected, the corresponding server name is shown on the right-hand side of the browser's status bar.
IE Tab This extension is derived from the famous extension IE View, but much different. While IE View always open IE-only pages in a seperate Internet Explorer window, IE Tab can view them in a Mozilla/Firefox tab.
FireFTP FireFTP is a free, secure, cross-platform FTP client for Mozilla Firefox which provides easy and intuitive access to FTP servers.
DevBoi DevBoi is sidebar extension for Mozilla and Firefox browsers. Sidebar offers easy access to web-development documentations and reference manuals on the Internet – everything just one double-click away. If you have used DevEdge sidebar, you’ll definitely love this. In current version sidebar contains:
You can alter their values, add new parameters, switch get/post and more.
