Developer Tools

by Zulkarnain K.

52 Add-ons in this Collection

Firebug by Joe Hewitt, Jan Odvarko, others

Rated 5 out of 5 stars 1,650 reviews

2,866,444 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

749,244 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

215,620 users

Manage any SQLite database on your computer.

Tamper Data by Adam Judson

Rated 4 out of 5 stars 115 reviews

138,840 users

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

ColorZilla by Alex Sirota

Rated 5 out of 5 stars 284 reviews

311,573 users

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

Lightbeam for Firefox by Mozilla

Rated 3 out of 5 stars 317 reviews

412,449 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

205,777 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

241,073 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

115,797 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 154 reviews

118,676 users

An HTTP analyzer addon for Firefox

JSONView by Ben Hollis

Rated 5 out of 5 stars 115 reviews

85,444 users

View JSON documents in the browser.

JavaScript Deobfuscator by Wladimir Palant

Rated 4 out of 5 stars 19 reviews

55,515 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

30,969 users

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