Mozile - Mozile (Mozilla Inline Editor) is an in-browser, context-sensitive, XHTML editor. It can act as the client-side of a content-editing system or as a self-contained web word processor. Console² - 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. Leak Monitor - Detects one very specific type of leak in chrome JavaScript and in Web pages. Tuvbar - Toolbar extension for helping penetration-testers test the security of websites, networks and webpages. Web Developer - A toolbar with useful functions for website authors. Includes download, full feature list, screenshots, and discussion forums. HTML Validator - An HTML and SGML validator, based on the HTML Tidy and OpenSP algorithms originally developed by W3C. Checks pages on the fly. Colour Contrast Analyser - Reveals the colour contrast of all elements in the DOM. Aardvark - By clicking an element you will able to remove, view source, isolate and see element information. Modify Headers - Allows the user to add, modify and filter out HTTP request headers. DOM Inspector - 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. Flash Tracer - Shows all the output generated by any running flash swf movies ( the output generated by the trace flash method ). ColorZilla - Assists with color related tasks. Provides a collection of tools, including a color picker, an eyedropper that helps to get a color reading from anywhere in the browser window and a palette viewer that allows bookmarking and share a color palette. XPather - Generates XPaths while browsing or inspecting HTML/XML/*ML documents, evaluates XPaths, inspects the results and extracts the content. Link Evaluator - Evaluates the availability of on-line resources linked to from a given web page and assesses the response of each URL. Dust-Me Selectors - Finds and display unused CSS selectors. LinkChecker - Check the validity of links in a html document.