Web Developer's Toolbox

by Mozilla

12 Add-ons in this Collection

Firebug by Joe Hewitt, Jan Odvarko, others

Rated 4 out of 5 stars 2,063 reviews

1,934,776 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 459 reviews

615,891 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!

Greasemonkey by Anthony Lieuallen, Aaron Boodman, others

Rated 4 out of 5 stars 1,027 reviews

1,171,930 users

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

Stylish by userstyles.org

Rated 4 out of 5 stars 798 reviews

434,379 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 370 reviews

270,976 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.

User Agent Switcher by chrispederick

Rated 4 out of 5 stars 276 reviews

317,492 users

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

FireFTP by Mime Čuvalo

Rated 4 out of 5 stars 936 reviews

441,419 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!

Web Developer by chrispederick

Rated 5 out of 5 stars 258 reviews

445,768 users

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

ColorZilla by Alex Sirota

Rated 4 out of 5 stars 371 reviews

241,474 users

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

Tiny JavaScript Debugger by Patrick Brunschwig

Rated 4 out of 5 stars 8 reviews

35,502 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.

YSlow by YSlow

Rated 3 out of 5 stars 221 reviews

67,463 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.

Rainbow Color Tools by Heather Arthur

Rated 5 out of 5 stars 98 reviews

26,182 users

Color tools for web development.

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