Web Developer Necessities

by rdoherty

11 Add-ons in this Collection

Firebug by Joe Hewitt, Jan Odvarko, others

Rated 4 out of 5 stars 2,082 reviews

1,588,809 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 265 reviews

356,937 users

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

Tamper Data by Adam Judson

Rated 4 out of 5 stars 153 reviews

83,561 users

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

ColorZilla by Alex Sirota

Rated 4 out of 5 stars 379 reviews

198,590 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 171 reviews

108,911 users

View HTTP headers of a page and while browsing.

MeasureIt by Kevin Freitas

Rated 4 out of 5 stars 362 reviews

108,802 users

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

YSlow by YSlow

Rated 3 out of 5 stars 221 reviews

51,349 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.

Firefinder for Firebug by Robert Nyman

Rated 3 out of 5 stars 28 reviews

14,941 users

Finds HTML elements matching chosen CSS selector(s) or XPath expression

Firecookie by Jan Odvarko

Rated 4 out of 5 stars 61 reviews

1,550 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

Pixel Perfect by Mike Buckley, Lorne Markham, others

Rated 4 out of 5 stars 103 reviews

9,099 users

Pixel Perfect is a Firefox extension that allows web developers and designers to easily overlay a web composition with semi-transparent layers (images). These layers can be consequently used for per pixel comparison between the page and a layer.

FireRainbow by BinaryAge, Jan Odvarko

Rated 4 out of 5 stars 44 reviews

2,584 users

Javascript syntax highlighting for Firebug

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