Add-On Development

by sugsugat

26 Add-ons in this Collection

Firebug by Joe Hewitt, Jan Odvarko, others

Rated 5 out of 5 stars 1,828 reviews

2,079,762 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 235 reviews

471,833 users

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

SQLite Manager by lazierthanthou

Rated 5 out of 5 stars 51 reviews

193,492 users

Manage any SQLite database on your computer.

JSONView by Ben Hollis

Rated 5 out of 5 stars 160 reviews

109,658 users

View JSON documents in the browser.

HttpFox by Martin Theimer

Rated 4 out of 5 stars 168 reviews

85,678 users

An HTTP analyzer addon for Firefox

MeasureIt by Kevin Freitas

Rated 4 out of 5 stars 352 reviews

137,456 users

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

RefControl by James Abbatiello

Rated 4 out of 5 stars 183 reviews

80,956 users

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

YSlow by YSlow

Rated 3 out of 5 stars 210 reviews

79,906 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.

Quick Locale Switcher by ppclick

Rated 3 out of 5 stars 87 reviews

156,564 users

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

NoRedirect by Kai Liu

Rated 4 out of 5 stars 49 reviews

13,775 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.

DOM Inspector by SeaMonkey Council

Rated 5 out of 5 stars 66 reviews

120,535 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.

View Source Chart by Jennifer Madden

Rated 5 out of 5 stars 110 reviews

12,361 users

Inspect the DOM at lightning speed.

FireQuery by BinaryAge, Jan Odvarko

Rated 4 out of 5 stars 54 reviews

24,079 users

Firebug plugin for jQuery development

Firecookie by Jan Odvarko

Rated 4 out of 5 stars 61 reviews

2,848 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

Execute JS by Rudolf Noe

Rated 5 out of 5 stars 13 reviews

5,231 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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