Astral-devel pack

by Alexander Smirnov

106 Add-ons in this Collection

Firebug by Joe Hewitt, Jan Odvarko, others

Rated 5 out of 5 stars 1,828 reviews

2,180,026 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 262 reviews

342,133 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 228 reviews

506,234 users

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

SQLite Manager by lazierthanthou

Rated 5 out of 5 stars 46 reviews

200,978 users

Manage any SQLite database on your computer.

FirePath by Pierre Tholence

Rated 4 out of 5 stars 22 reviews

81,312 users

FirePath is a Firebug extension that adds a development tool to edit, inspect and generate XPath 1.0 expressions, CSS 3 selectors and JQuery selectors (Sizzle selector engine).

Tamper Data by Adam Judson

Rated 4 out of 5 stars 135 reviews

110,688 users

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

JavaScript Debugger by James Ross, Robert Ginda, others

Rated 4 out of 5 stars 50 reviews

116,688 users

As of Firefox 33, Venkman *no longer works*, as the APIs which it needs have been removed.

Venkman is the code name for Mozilla's JavaScript Debugger. Venkman aimed to provide a powerful JavaScript debugging environment for Mozilla based browsers.

ColorZilla by Alex Sirota

Rated 5 out of 5 stars 306 reviews

276,670 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 168 reviews

155,171 users

View HTTP headers of a page and while browsing.

JSONView by Ben Hollis

Rated 5 out of 5 stars 152 reviews

109,934 users

View JSON documents in the browser.

SeoQuake SEO extension by SeoQuake Team

Rated 4 out of 5 stars 210 reviews

70,079 users

Accelerate your SEO efforts on the fly. SEOquake is a free plugin for browsers that provides you with key SEO metrics for a specific page, along with other useful tools such as SEO Audit and many others.

HttpFox by Martin Theimer

Rated 4 out of 5 stars 166 reviews

88,925 users

An HTTP analyzer addon for Firefox

MeasureIt by Kevin Freitas

Rated 4 out of 5 stars 349 reviews

144,797 users

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

Favorites (Selenium IDE) by Samit Badle

Rated 4 out of 5 stars 3 reviews

18,578 users

A plugin for Selenium-IDE to have favorite test suites and open and execute the test suites with a single click

JavaScript Deobfuscator by Wladimir Palant

Rated 5 out of 5 stars 20 reviews

56,893 users

This add-on shows you what JavaScript code runs on a web page, even if it is obfuscated and generated on the fly. Simply open JavaScript Deobfuscator from the Web Developer menu and watch the scripts being compiled/executed.
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