WebDev, Design & Analytics

by kozaki

88 Add-ons in this Collection

Firebug by Joe Hewitt, Jan Odvarko, others

Rated 5 out of 5 stars 1,793 reviews

2,317,059 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 251 reviews

369,993 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 217 reviews

555,467 users

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

FireFTP by Mime Čuvalo

Rated 4 out of 5 stars 934 reviews

550,443 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!

Flagfox by Dave G

Rated 5 out of 5 stars 635 reviews

605,444 users

Displays a country flag depicting the location of the current website's server and provides a multitude of tools such as site safety checks, whois, translation, similar sites, validation, URL shortening, and more...

Tamper Data by Adam Judson

Rated 4 out of 5 stars 132 reviews

114,867 users

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

ColorZilla by Alex Sirota

Rated 5 out of 5 stars 305 reviews

295,325 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 157 reviews

169,043 users

View HTTP headers of a page and while browsing.

Cookies Manager+ by V@no

Rated 4 out of 5 stars 74 reviews

109,285 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.

MeasureIt by Kevin Freitas

Rated 4 out of 5 stars 339 reviews

153,230 users

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

User Agent Overrider by muzuiget

Rated 4 out of 5 stars 49 reviews

63,655 users

Override browser user agent string

User-Agent Switcher by Linder

Rated 4 out of 5 stars 9 reviews

24,948 users

Quickly and easily switch between popular user-agent strings.

HttpFox by Martin Theimer

Rated 4 out of 5 stars 163 reviews

96,152 users

An HTTP analyzer addon for Firefox

YSlow by YSlow

Rated 3 out of 5 stars 195 reviews

101,438 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.

SeoQuake SEO extension by SeoQuake Team

Rated 4 out of 5 stars 207 reviews

83,638 users

Seoquake is a Firefox SEO extension aimed primarily at helping web masters who deal with search engine optimization (SEO), social media optimization (SMO) and internet promotion. Seoquake allows to investigate many important SEO parameters.
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