by Arno Nym

10 Add-ons in this Collection

Firebug by Joe Hewitt, Jan Odvarko, others

Rated 5 out of 5 stars 1,799 reviews

2,256,333 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...

iMacros for Firefox by iMacros

Rated 4 out of 5 stars 381 reviews

380,183 users

Automate Firefox. Record and replay repetitious work. If you love the Firefox web browser, but are tired of repetitive tasks like visiting the same sites every days, filling out forms, and remembering passwords, then iMacros for Firefox is the soluti...

Web Developer by chrispederick

Rated 5 out of 5 stars 218 reviews

537,789 users

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

SQLite Manager by lazierthanthou

Rated 5 out of 5 stars 40 reviews

199,849 users

Manage any SQLite database on your computer.

Tamper Data by Adam Judson

Rated 4 out of 5 stars 133 reviews

113,049 users

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

Live HTTP Headers by Daniel Savard, Nikolas Co

Rated 4 out of 5 stars 159 reviews

164,090 users

View HTTP headers of a page and while browsing.

HackBar by Johan Adriaans, Pedro Laguna

Rated 4 out of 5 stars 41 reviews

32,231 users

Simple security audit / Penetration test tool.

HttpFox by Martin Theimer

Rated 4 out of 5 stars 163 reviews

93,503 users

An HTTP analyzer addon for Firefox

YSlow by YSlow

Rated 3 out of 5 stars 199 reviews

95,993 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.

View Source Chart by Jennifer Madden

Rated 5 out of 5 stars 109 reviews

14,438 users

Inspect the DOM at lightning speed.

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