Developer Tools

by Zulkarnain K.

51 Add-ons in this Collection

Firebug by Joe Hewitt, Jan Odvarko, others

Rated 5 out of 5 stars 1,766 reviews

2,403,479 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

Rated 4 out of 5 stars 734 reviews

736,737 users

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 209 reviews

584,755 users

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

SQLite Manager by lazierthanthou

Rated 5 out of 5 stars 31 reviews

200,621 users

Manage any SQLite database on your computer.

Tamper Data by Adam Judson

Rated 4 out of 5 stars 128 reviews

118,947 users

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

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

Rated 4 out of 5 stars 78 reviews

132,270 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.

ColorZilla by Alex Sirota

Rated 5 out of 5 stars 300 reviews

264,467 users

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

Live HTTP Headers by Daniel Savard, Nikolas Co

Rated 4 out of 5 stars 154 reviews

178,586 users

View HTTP headers of a page and while browsing.

Lightbeam for Firefox by Mozilla

Rated 4 out of 5 stars 387 reviews

420,070 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.

JavaScript Deobfuscator by Wladimir Palant

Rated 4 out of 5 stars 26 reviews

56,787 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.

JSONView by Ben Hollis

Rated 5 out of 5 stars 126 reviews

96,674 users

View JSON documents in the browser.

HttpFox by Martin Theimer

Rated 4 out of 5 stars 161 reviews

98,469 users

An HTTP analyzer addon for Firefox

Remote XUL Manager by Jorge Villalobos

Rated 5 out of 5 stars 34 reviews

39,420 users

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

about:addons-memory by Nils Maier

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

JavaScript Debugger by James Ross, Robert Ginda, others

Rated 4 out of 5 stars 49 reviews

147,621 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.
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