The Web Developer extension adds various web developer tools to the browser.
Advanced Eyedropper, Color Picker, Gradient Generator and other colorful goodies...
Finds HTML elements matching chosen CSS selector(s) or XPath expression
Firecookie is an extension for Firebug that makes possible to view and manage cookies in your browser
Firecookie is part of Firebug since Firebug 1.10
Collections are groups of related add-ons that anyone can create and share.Explore Collections