Web Development

by Fotis Evangelou

28 Add-ons in this Collection

Firebug by Joe Hewitt, Jan Odvarko, others

Rated 5 out of 5 stars 1,761 reviews

2,722,204 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...

User Agent Switcher by chrispederick

Rated 4 out of 5 stars 238 reviews

429,568 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 205 reviews

671,939 users

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

FireFTP by Mime Čuvalo

Rated 4 out of 5 stars 917 reviews

653,052 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!

SQLite Manager by lazierthanthou

Rated 5 out of 5 stars 30 reviews

218,592 users

Manage any SQLite database on your computer.

ColorZilla by Alex Sirota

Rated 5 out of 5 stars 300 reviews

300,909 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 154 reviews

202,026 users

View HTTP headers of a page and while browsing.

MeasureIt by Kevin Freitas

Rated 4 out of 5 stars 327 reviews

174,851 users

Draw a ruler across any webpage to check the width, height, or alignment of page elements in pixels.

Cookies Manager+ by V@no

Rated 4 out of 5 stars 70 reviews

115,286 users

Cookies manager to view, edit and create new cookies. It also shows extra information about cookies, allows edit multiple cookies at once and backup/restore them.

YSlow by YSlow

Rated 3 out of 5 stars 181 reviews

130,420 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.

Firefox OS 1.1 Simulator by Myk Melez, J. Ryan Stinnett

Firefox OS Simulator is a test environment for Firefox OS. Use it to test your apps in a Firefox OS-like environment that looks and feels like a mobile phone. After installing it, go to Web Developer > Firefox OS Simulator to access its features.

Modify Headers by Gareth Hunt

Rated 4 out of 5 stars 70 reviews

165,868 users

Add, modify and filter the HTTP request headers sent to web servers. This addon is particularly useful for Mobile web development, HTTP testing and privacy.

Wappalyzer by Elbert Alias

Rated 4 out of 5 stars 95 reviews

74,982 users

Wappalyzer is a browser extension that identifies software on websites.

Rainbow Color Tools by Heather Arthur

Rated 5 out of 5 stars 92 reviews

42,851 users

Color tools for web development.

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

Exif Viewer by Alan Raskin

Rated 4 out of 5 stars 83 reviews

76,683 users

Displays the Exif and IPTC data in local and remote JPEG images.
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