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Aardvark - http://karmatics.com/aardvark/
By clicking an element you will able to remove, view source, isolate and see element information.

ColorZilla - http://www.iosart.com/firefox/colorzilla/
A collection of tools, including a Color Picker similar to the one found in Photoshop, an Eyedropper that helps to get a color reading from anywhere in the browser window and a Page Zoomer that helps set the page zoom to anything between 20 and 1000 percent.

Colour Contrast Analyser - http://juicystudio.com/article/colour-contrast-analyser-firefox-extension.php
Reveals the colour contrast of all elements in the DOM.

Console² - http://console2.mozdev.org/
Firefox extension that replaces the JavaScript Console. Display errors filtered by type (Errors, Warnings, Messages), language (JavaScript, CSS, XML) and context (Chrome, Content). Useful for web and extension developers.

cuneAform HTML/XHTML Editor - http://cuneaform.mozdev.org/
cuneAform has been designed to create a HTML Editor that anyone can use.

DOM Inspector - https://addons.mozilla.org/firefox/addon/6622
A tool that can be used to inspect and edit the live DOM of a web document or XUL application. Restores functionality present prior to Firefox 3.0. Description and user comments.

Dust-Me Selectors - http://www.sitepoint.com/dustmeselectors/
Finds and display unused CSS selectors.

Firebug - http://www.getfirebug.com/
Tools for web development, allow inspect, edit and monitor CSS, HTML and JavaScript live in any web page. Include documentation, FAQs, videos and discussion groups.

Firefox Extensions for Web Developers - http://loadaveragezero.com/drx/extensions
A list of extensions built primarily for web designers and programmers.

FirePHP - http://www.firephp.org/
Allows to print to the Firebug Console using a simple PHP function call.

Flash Tracer - http://www.sephiroth.it/firefox/flashtracer/
Shows all the output generated by any running flash swf movies ( the output generated by the trace flash method ).

HTML Validator - http://users.skynet.be/mgueury/mozilla/
An HTML and SGML validator, based on the HTML Tidy and OpenSP algorithms originally developed by W3C. Checks pages on the fly.

JS Console Extras - https://addons.mozilla.org/firefox/37/
Adds a JS Console context-menu item which presents a "Toolbars" submenu for hiding or showing the eval / mode toolbars.

LinkChecker - http://www.kevinfreitas.net/extensions/linkchecker/
Check the validity of links in a html document.

Michael's Firefox Extensions - http://www.nu22.com/firefox/
Extensions for HTML, CSS and RSS validation.

Modify Headers - http://modifyheaders.mozdev.org/
Allows the user to add, modify and filter out HTTP request headers.

Tuvbar - http://tuvbar.mozdev.org
Toolbar extension for helping penetration-testers test the security of websites, networks and webpages.

View Source Chart - http://jennifermadden.com/scripts/ViewRenderedSource.html
Draws a color, coded chart of a webpage's source code.

Web Developer Extension - http://chrispederick.com/work/web-developer/
A toolbar with useful functions for website authors. Includes download, full feature list, screenshots, and discussion forums.

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