The Firebug Web Page Debugger, Firefox version more info
This extension brings a new Events panel that lists all of the event handlers on the page grouped by event type. The panel also nicely integrates with other Firebug panels and allows to quickly find out, which HTML element is associated with specific event listener or see the Javascript source code. more info
Firediff is a Firebug extension that tracks changes to a pages DOM and CSS. more info
List elements for each CSS selector, trial CSS selectors by typing them in.
Allows exporting data from the Net panel. more info
View and manage cookies in your browser more info
Enhances Firebug to understand JavaScript libraries and frameworks (like ExtJS, Dojo Toolkit, SproutCore, Closure Library, qooxdoo, YUI3, and jQuery/jQueryUI), making things more obvious and helpful when debugging. Trial version. more info
Log to your Firebug Console from PHP (FirePHP< 1.0) more info
extends Firebug's activation model with advanced features.
Test Driver for Firebug Itself, useful for extension authors
