Add-On Development

by sugsugat

26 Add-ons in this Collection

Firebug by Joe Hewitt, Jan Odvarko, others

Rated 5 out of 5 stars 1,766 reviews

2,458,043 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 209 reviews

604,332 users

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

SQLite Manager by lazierthanthou

Rated 5 out of 5 stars 32 reviews

204,694 users

Manage any SQLite database on your computer.

MeasureIt by Kevin Freitas

Rated 4 out of 5 stars 328 reviews

157,717 users

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

JSONView by Ben Hollis

Rated 5 out of 5 stars 127 reviews

100,762 users

View JSON documents in the browser.

HttpFox by Martin Theimer

Rated 4 out of 5 stars 161 reviews

102,399 users

An HTTP analyzer addon for Firefox

YSlow by YSlow

Rated 3 out of 5 stars 186 reviews

115,472 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.

RefControl by James Abbatiello

Rated 4 out of 5 stars 177 reviews

78,399 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 81 reviews

226,100 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 61 reviews

142,634 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.

FireQuery by BinaryAge, Jan Odvarko

Rated 4 out of 5 stars 51 reviews

35,756 users

Firebug plugin for jQuery development

Firecookie by Jan Odvarko

Rated 4 out of 5 stars 61 reviews

5,138 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

NoRedirect by Kai Liu

Rated 4 out of 5 stars 49 reviews

12,477 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.

View Source Chart by Jennifer Madden

Rated 5 out of 5 stars 104 reviews

16,662 users

Inspect the DOM at lightning speed.

Execute JS by Rudolf Noe

Rated 5 out of 5 stars 13 reviews

6,092 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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