Developer Tools

by Zulkarnain K.

52 Add-ons in this Collection

Firebug by Joe Hewitt, Jan Odvarko, others

Rated 5 out of 5 stars 1,649 reviews

2,626,209 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...

Stylish by Jason Barnabe

Restyle the web with Stylish, a user styles manager. Stylish lets you easily install themes and skins for Google, Facebook, YouTube, Orkut, and many, many other sites. You can even customize Firefox and other programs themselves.

Web Developer by chrispederick

Rated 5 out of 5 stars 183 reviews

687,408 users

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

SQLite Manager by lazierthanthou

Rated 5 out of 5 stars 57 reviews

201,399 users

Manage any SQLite database on your computer.

Tamper Data by Adam Judson

Rated 4 out of 5 stars 115 reviews

129,852 users

Use tamperdata to view and modify HTTP/HTTPS headers and post parameters...

ColorZilla by Alex Sirota

Rated 5 out of 5 stars 283 reviews

318,658 users

Advanced Eyedropper, Color Picker, Gradient Generator and other colorful goodies...

Lightbeam for Firefox by Mozilla

Rated 3 out of 5 stars 316 reviews

393,971 users

Lightbeam is a Firefox add-on that enables you to see the first and third party sites you interact with on the Web. Using interactive visualizations, Lightbeam shows you the relationships between these third parties and the sites you visit.

Live HTTP Headers by Daniel Savard, Nikolas Co

Rated 4 out of 5 stars 136 reviews

193,660 users

View HTTP headers of a page and while browsing.

JavaScript Debugger by James Ross, Robert Ginda, others

Rated 4 out of 5 stars 47 reviews

228,198 users

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

RESTClient, a debugger for RESTful web services. by Chao ZHOU

Rated 4 out of 5 stars 67 reviews

102,802 users

Notice: some important features (XML indentation and load old saved requests) are missing in version 2.0.0, please update to version 2.0.1.

Please follow the link ("View other versions") below To install version 2.0.1.

HttpFox by Martin Theimer

Rated 4 out of 5 stars 153 reviews

106,655 users

An HTTP analyzer addon for Firefox

JSONView by Ben Hollis

Rated 5 out of 5 stars 115 reviews

78,338 users

View JSON documents in the browser.

JavaScript Deobfuscator by Wladimir Palant

Rated 4 out of 5 stars 19 reviews

52,612 users

This add-on shows you what JavaScript code runs on a web page, even if it is obfuscated and generated on the fly. Simply open JavaScript Deobfuscator from the Web Developer menu and watch the scripts being compiled/executed.

about:addons-memory by Nils Maier

Adds an about:addons-memory page that details add-on memory usage

Remote XUL Manager by Jorge Villalobos

Rated 5 out of 5 stars 29 reviews

27,479 users

Manages the Remote XUL whitelist to allow websites and local files to load XUL content.
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