1.9.1

The Firebug Web Page Debugger, Firefox versionmore info

0.1b9

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

1.1.3

Firediff is a Firebug extension that tracks changes to a pages DOM and CSS.more info

0.1a3

List elements for each CSS selector, trial CSS selectors by typing them in.

0.8b17

Allows exporting data from the Net panel.more info

1.2.1

View and manage cookies in your browser.more info

1.1.10

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

1.0a9

Easy access to Dojo features: list dijit registry, and inspect visual widgets, view and breakpoint connections and subscriptions.more info

0.5.0

Log to your Firebug Console from PHP.more info

0.1.a6

Extends Firebug's activation model with advanced features.

1.7b17

Test Driver for Firebug itself, useful for extension authors.

1.6.1

Pixel Perfect is a Firefox/Firebug extension that allows web developers and designers to easily overlay a web composition over top of the developed HTML.

0.4.9

Edit your css with FireBug and let cssUpdater update the corresponding property and value in your css source file. Pixel push with ease!more info

Tested with Firebug