Developer Tools

by Zulkarnain K.

52 Add-ons in this Collection

Firebug by Joe Hewitt, Jan Odvarko, others

Rated 5 out of 5 stars 1,799 reviews

1,991,765 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 763 reviews

625,731 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 218 reviews

478,729 users

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

Lightbeam for Firefox by Mozilla

Rated 4 out of 5 stars 408 reviews

606,007 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.

SQLite Manager by lazierthanthou

Rated 5 out of 5 stars 40 reviews

182,920 users

Manage any SQLite database on your computer.

Tamper Data by Adam Judson

Rated 4 out of 5 stars 133 reviews

103,834 users

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

JavaScript Debugger by James Ross, Robert Ginda, others

Rated 4 out of 5 stars 50 reviews

120,165 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.

ColorZilla by Alex Sirota

Rated 5 out of 5 stars 306 reviews

256,187 users

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

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

Rated 4 out of 5 stars 84 reviews

118,845 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.

Live HTTP Headers by Daniel Savard, Nikolas Co

Rated 4 out of 5 stars 159 reviews

146,457 users

View HTTP headers of a page and while browsing.

JavaScript Deobfuscator by Wladimir Palant

Rated 5 out of 5 stars 19 reviews

53,574 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 134 reviews

89,248 users

View JSON documents in the browser.

HttpFox by Martin Theimer

Rated 4 out of 5 stars 164 reviews

81,041 users

An HTTP analyzer addon for Firefox

Remote XUL Manager by Jorge Villalobos

Rated 5 out of 5 stars 35 reviews

71,707 users

Manages the Remote XUL whitelist to allow websites and local files to load XUL content. For versions compatible with Firefox 41 and lower, see All Versions page below.

Extension Auto-Installer by Wladimir Palant

Rated 5 out of 5 stars 15 reviews

3,608 users

Extension Auto-Installer is a helper for Firefox/SeaMonkey/Thunderbird extension developers: it allows automatically adding or updating browser extensions, e.g. via command line tools. This makes testing your changes easier.
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