Developer Tools

by Jessy Houle

18 Add-ons in this Collection

Firebug by Joe Hewitt, Jan Odvarko, others

Rated 5 out of 5 stars 1,799 reviews

2,256,333 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...

Greasemonkey by Anthony Lieuallen, Aaron Boodman, others

Rated 4 out of 5 stars 964 reviews

1,269,077 users

Customize the way a web page displays or behaves, by using small bits of JavaScript.

iMacros for Firefox by iMacros

Rated 4 out of 5 stars 381 reviews

380,183 users

Automate Firefox. Record and replay repetitious work. If you love the Firefox web browser, but are tired of repetitive tasks like visiting the same sites every days, filling out forms, and remembering passwords, then iMacros for Firefox is the soluti...

Web Developer by chrispederick

Rated 5 out of 5 stars 218 reviews

537,789 users

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

Tamper Data by Adam Judson

Rated 4 out of 5 stars 133 reviews

113,049 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 84 reviews

141,100 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 306 reviews

286,986 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 159 reviews

164,090 users

View HTTP headers of a page and while browsing.

JSONView by Ben Hollis

Rated 5 out of 5 stars 134 reviews

102,838 users

View JSON documents in the browser.

YSlow by YSlow

Rated 3 out of 5 stars 199 reviews

95,993 users

YSlow analyzes web pages and suggests ways to improve their performance based on a set of rules for high performance web pages. is the official open source website.

Poster by Alex Milowski

Rated 4 out of 5 stars 61 reviews

49,200 users

A developer tool for interacting with web services and other web resources that lets you make HTTP requests, set the entity body, and content type. This allows you to interact with web services and inspect the results...

Selenium IDE by Jason Huggins, Adam Goucher, others

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Rated 5 out of 5 stars 1 review

5,479 users

Selenium IDE is an integrated development environment for Selenium tests. It is implemented as a Firefox extension, and allows you to record, edit, and debug tests.

Rainbow Color Tools by Heather Arthur

Rated 5 out of 5 stars 94 reviews

33,253 users

Color tools for web development.

Color picker and eyedropper + saving colors and trying out colors with drag and drop.

Javascript Deminifier by Ben Murphy

Rated 4 out of 5 stars 17 reviews

11,322 users

This addon will deminify javascript before it is downloaded. This is useful when using firebug to debug a javascript application that uses javascript that has been minified.

FireQuery by BinaryAge, Jan Odvarko

Rated 4 out of 5 stars 52 reviews

29,401 users

Firebug plugin for jQuery development
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