Add-On Development

by sugsugat

26 Add-ons in this Collection

Firebug by Joe Hewitt, Jan Odvarko, others

Rated 4 out of 5 stars 2,119 reviews

1,801,421 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 263 reviews

413,214 users

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

SQLite Manager by lazierthanthou

Rated 4 out of 5 stars 70 reviews

184,829 users

Manage any SQLite database on your computer.

JSONView by Ben Hollis

Rated 5 out of 5 stars 177 reviews

108,381 users

View JSON documents in the browser.

MeasureIt by Kevin Freitas

Rated 4 out of 5 stars 360 reviews

120,542 users

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

HttpFox by Martin Theimer

Rated 4 out of 5 stars 172 reviews

75,264 users

An HTTP analyzer addon for Firefox

YSlow by YSlow

Rated 3 out of 5 stars 221 reviews

62,894 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.

NoRedirect by Kai Liu

Rated 4 out of 5 stars 52 reviews

15,791 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.

RefControl by James Abbatiello

Rated 4 out of 5 stars 187 reviews

81,071 users

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

Quick Locale Switcher by ppclick

Rated 3 out of 5 stars 89 reviews

195,182 users

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

DOM Inspector by SeaMonkey Council

Rated 5 out of 5 stars 72 reviews

105,243 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 61 reviews

2,187 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

FireQuery by BinaryAge, Jan Odvarko

Rated 4 out of 5 stars 55 reviews

18,649 users

Firebug plugin for jQuery development

View Source Chart by Jennifer Madden

Rated 5 out of 5 stars 109 reviews

10,520 users

Enables accelerated human processing of DOM

Execute JS by Rudolf Noe

Rated 5 out of 5 stars 15 reviews

4,830 users

Execute JS is a enhanced JavaScript-Console, where you can comfortably enter and execute arbitrary JavaScript-Code and modify functions...
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