Add-ons

SQLite Manager by lazierthanthou

Manage any SQLite database on your computer.

Element Hiding Helper for Adblock Plus by Felix Dahlke

Fight the text ads! Element Hiding Helper is a companion extension for Adblock Plus meant to make creating element hiding rules easier.

HttpFox by Martin Theimer

An HTTP analyzer addon for Firefox

Collector's Note If you need to know which headers are sent to and received from a server. It doesn't use external resources, contrary to many other such extensions, and thus doesn't breach security.

Image Zoom by Jason Adams

Adds zoom and rotation functionality for images...

DOM Inspector by SeaMonkey Council

DOM Inspector is a tool that can be used to inspect and edit the live DOM of any web document or XUL application. The DOM can be navigated using a two-paned window displaying a variety of different views on the document and all nodes within.

Execute JS by Rudolf Noe

Execute JS is a enhanced JavaScript-Console, where you can comfortably enter and execute arbitrary JavaScript-Code and modify functions...

View Dependencies by Florian QUEZE

View Dependencies adds a tab to the Page Info window, in which it lists all the files which were loaded to show the current page.

Extension List Dumper by Sogame

This extension adds a button ("Dump list") to the Add-ons window. When this button is pressed, a new window is opened with the list of installed extensions, themes or plugins...

Collector's Note I think this is a must-have. There's no easier way to show versions and status of all addons, plugins and themes installed, and the lists can be saved to disk as text and HTML.

Console² by Philip Chee, zeniko

Console² (pronounced Console Squared or Console Two) replaces the JavaScript Console with what could be the next generation Error Console. From v0.5 includes the Console Filter extension previously available separately from the Console² website.