The Web Developer extension adds various web developer tools to the browser.
FirePath is a Firebug extension that adds a development tool to edit, inspect and generate XPath 1.0 expressions, CSS 3 selectors and JQuery selectors (Sizzle selector engine).
View and manage downloads from a tidy statusbar - without the download window getting in the way of your web browsing.
Thanks Tekzilla for your awesome review! Click here to see their video: http://youtu.be/BUDqWrJ-Vao
CodeBurner is a Firefox add-on that integrates with Firebug, to extend it with reference material for HTML and CSS.
HTML Validator is a Mozilla extension that adds HTML validation inside Firefox and Mozilla. The number of errors of a HTML page is seen on the form of an icon
For Firefox 23+, you need 0.958 (under review)
Easy cache status & management from status...
A plugin for Selenium-IDE to convert one or more test suites (and included test cases) from the html format to another format supported by Selenium-IDE
Collections are groups of related add-ons that anyone can create and share.Explore Collections