Extension Developer's Collection

by bijolianabhi

11 Add-ons in this Collection

Firebug by Joe Hewitt, Jan Odvarko, others

Rated 5 out of 5 stars 1,773 reviews

2,437,929 users

Firebug integrates with Firefox to put a wealth of development tools at your fingertips while you browse. You can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page...

User Agent Switcher by chrispederick

Rated 4 out of 5 stars 246 reviews

390,507 users

The User Agent Switcher extension adds a menu and a toolbar button to switch the user agent of a browser.

Web Developer by chrispederick

Rated 5 out of 5 stars 213 reviews

580,217 users

The Web Developer extension adds various web developer tools to the browser.

SQLite Manager by lazierthanthou

Rated 5 out of 5 stars 35 reviews

204,623 users

Manage any SQLite database on your computer.

JavaScript Debugger by James Ross, Robert Ginda, others

Rated 4 out of 5 stars 50 reviews

139,493 users

As of Firefox 33, Venkman *no longer works*, as the APIs which it needs have been removed.

Venkman is the code name for Mozilla's JavaScript Debugger. Venkman aimed to provide a powerful JavaScript debugging environment for Mozilla based browsers.

Execute JS by Rudolf Noe

Rated 5 out of 5 stars 13 reviews

5,671 users

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

Console² by Philip Chee, zeniko

Rated 5 out of 5 stars 48 reviews

10,364 users

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.

Developer Assistant by Ted Mielczarek, Gavin Sharp, others

Rated 4 out of 5 stars 46 reviews

3,220 users

A suite of tools for developers.

ViewAbout by Gary Kwong

Rated 4 out of 5 stars 15 reviews

3,399 users

Enables access to various about: dialogs from the View menu.

Chrome List by Gijs Kruitbosch

Rated 4 out of 5 stars 27 reviews

211 users

Lets you take a peek at the files under the hood of your Firefox installation and profile...

DOM Inspector by Scott MacGregor

Rated 2 out of 5 stars 5 reviews

169 users

Inspect the DOM of HTML, XUL, and XML pages, including the mail...

What are Collections?

Collections are groups of related add-ons that anyone can create and share.

Explore Collections

Recently Viewed