Developer Tools

by Jessy Houle

18 Add-ons in this Collection

Firebug by Joe Hewitt, Jan Odvarko, others

Rated 5 out of 5 stars 1,783 reviews

2,427,357 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 956 reviews

1,266,788 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 378 reviews

421,628 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 216 reviews

576,477 users

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

Tamper Data by Adam Judson

Rated 4 out of 5 stars 130 reviews

118,403 users

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

ColorZilla by Alex Sirota

Rated 5 out of 5 stars 302 reviews

292,845 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 82 reviews

151,532 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 155 reviews

178,291 users

View HTTP headers of a page and while browsing.

JSONView by Ben Hollis

Rated 5 out of 5 stars 132 reviews

107,813 users

View JSON documents in the browser.

YSlow by YSlow

Rated 3 out of 5 stars 192 reviews

109,194 users

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

Poster by Alex Milowski

Rated 4 out of 5 stars 61 reviews

54,878 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...

Rainbow Color Tools by Heather Arthur

Rated 5 out of 5 stars 93 reviews

37,237 users

Color tools for web development.

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

FireQuery by BinaryAge, Jan Odvarko

Rated 4 out of 5 stars 52 reviews

33,560 users

Firebug plugin for jQuery development

Javascript Deminifier by Ben Murphy

Rated 4 out of 5 stars 17 reviews

12,090 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.

Regular Expressions Tester by Sebo

Rated 4 out of 5 stars 24 reviews

7,162 users

Testing tool for regular expressions with color highlighting (including submatches) and helpers for creating expressions
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