Test Pilot, Added: September 17, 2009
Help us make Firefox better by joining our structured user studies! If you are running Firefox 4 beta 1 and beta 2, you don't need to download this add-on since you are already a Test Pilot!
See also
July 15, 2010
FireXPath is a Firebug extension that adds a development tool to edit, inspect and generate XPath expressions.
July 12, 2010
Track Changes in Firebug
July 06, 2010
Add TortoiseSVN commands to link context menus to allow easily browsing Subversion repositories. Must have TortoiseSVN already installed.
June 23, 2010
Firecookie is an extension for Firebug that makes possible to view and manage cookies in your browser
June 12, 2010
Detects what javascript libraries are being used on the current page and displays the result as icons with detailed tooltips in the statusbar.