Add-On Development

by sugsugat

26 Add-ons in this Collection

Firebug by Joe Hewitt, Jan Odvarko, others

Rated 5 out of 5 stars 1,650 reviews

2,866,444 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...

Web Developer by chrispederick

Rated 5 out of 5 stars 183 reviews

749,244 users

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

SQLite Manager by lazierthanthou

Rated 5 out of 5 stars 57 reviews

215,620 users

Manage any SQLite database on your computer.

HttpFox by Martin Theimer

Rated 4 out of 5 stars 154 reviews

118,676 users

An HTTP analyzer addon for Firefox

MeasureIt by Kevin Freitas

Rated 4 out of 5 stars 305 reviews

174,329 users

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

YSlow by YSlow

Rated 3 out of 5 stars 167 reviews

147,743 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.

JSONView by Ben Hollis

Rated 5 out of 5 stars 115 reviews

85,444 users

View JSON documents in the browser.

RefControl by James Abbatiello

Rated 4 out of 5 stars 151 reviews

106,540 users

Control what gets sent as the HTTP Referer on a per-site basis.

Quick Locale Switcher by ppclick

Rated 4 out of 5 stars 69 reviews

364,192 users

Allows you to quickly switch to a different language (User Interface, Spell Checker Dictionary and Website content) in your Mozilla application.

FireQuery by BinaryAge

Rated 4 out of 5 stars 43 reviews

49,582 users

Firebug plugin for jQuery development

DOM Inspector by SeaMonkey Council

Rated 5 out of 5 stars 55 reviews

153,953 users

DOM Inspector is a tool that can be used to inspect and edit the live DOM of any web document or XUL application. The DOM can be navigated using a two-paned window displaying a variety of different views on the document and all nodes within.

Firecookie by Jan Odvarko

Rated 4 out of 5 stars 57 reviews

7,245 users

Firecookie is an extension for Firebug that makes possible to view and manage cookies in your browser

Firecookie is part of Firebug since Firebug 1.10

View Source Chart by Jennifer Madden

Rated 5 out of 5 stars 99 reviews

21,487 users

Inspect the DOM at lightning speed.

NoRedirect by Kai Liu

Rated 4 out of 5 stars 43 reviews

10,534 users

NoRedirect lets the user take control of HTTP redirects. It can be used to interdict an ISP's DNS search redirection hijacks, preview/screen "shortened" URLs (e.g., TinyURL), stop the annoying redirection of "smart" error pages, etc.

Console² by Philip Chee, zeniko

Rated 5 out of 5 stars 45 reviews

16,827 users

Console² (pronounced Console Squared or Console Two) replaces the JavaScript Console with what could be the next generation Error Console. From v0.5 includes the Console Filter extension previously available separately from the Console² website.
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