Web Developer's Toolbox

by Mozilla

12 Add-ons in this Collection

Greasemonkey by Anthony Lieuallen, Aaron Boodman, others

Rated 4 out of 5 stars 1,159 reviews

864,202 users

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

Firebug by Joe Hewitt, Jan Odvarko, others

Rated 4 out of 5 stars 2,108 reviews

1,329,451 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...

iMacros for Firefox by Ipswitch, Inc.

Rated 4 out of 5 stars 526 reviews

1,279,178 users

Automate Firefox. Record and replay repetitive tasks. If you're tired of manually visiting the same sites, filling out forms, downloading files and extracting data, then iMacros is for you! Save time, effort and money with iMacros browser automation!

Stylish by userstyles.org

Rated 4 out of 5 stars 877 reviews

317,881 users

Restyle the web with Stylish, a user styles manager. Stylish lets you easily install themes and skins for Google, Facebook, YouTube, Tumblr, and many, many other sites. You can even customize Firefox and other programs themselves.

FoxyProxy Standard by Eric H. Jung, groeg, others

Rated 4 out of 5 stars 398 reviews

183,197 users

FoxyProxy is an advanced proxy management tool that completely replaces Firefox's limited proxying capabilities. For a simpler tool and less advanced configuration options, please use FoxyProxy Basic.

FireFTP by Mime Čuvalo

Rated 4 out of 5 stars 946 reviews

301,231 users

FireFTP is a free, secure, cross-platform FTP/SFTP client for Mozilla Firefox which provides easy and intuitive access to FTP/SFTP servers.

Check out my new project, FireSSH!

User Agent Switcher by chrispederick

Rated 4 out of 5 stars 276 reviews

212,328 users

The User Agent Switcher extension adds a menu and a toolbar button to switch the user agent of a browser.

Web Developer by chrispederick

Rated 5 out of 5 stars 272 reviews

283,945 users

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

ColorZilla by Alex Sirota

Rated 4 out of 5 stars 384 reviews

163,457 users

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

YSlow by YSlow

Rated 3 out of 5 stars 221 reviews

37,624 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.

Tiny JavaScript Debugger by Patrick Brunschwig

Rated 4 out of 5 stars 8 reviews

24,471 users

TinyJSD is a JavaScript debugger for privileged code running Mozilla products like Firefox, Thunderbird, SeaMonkey. It serves to debug the application as well as extensions written in JavaScript.

Rainbow Color Tools by Heather Arthur

Rated 5 out of 5 stars 96 reviews

17,707 users

Color tools for web development.

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