Development

by Alexandru Plugaru

16 Add-ons in this Collection

Adblock Plus by Wladimir Palant

Rated 5 out of 5 stars 4,302 reviews

18,955,577 users

Blocks annoying video ads on YouTube, Facebook ads, banners and much more.

Adblock Plus blocks all annoying ads, and supports websites by not blocking unobtrusive ads by default (configurable).

Firebug by Joe Hewitt, Jan Odvarko, others

Rated 5 out of 5 stars 1,650 reviews

2,865,909 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 183 reviews

746,665 users

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

FoxyProxy Standard by Eric H. Jung

Rated 4 out of 5 stars 295 reviews

379,070 users

FoxyProxy is an advanced proxy management tool that completely replaces Firefox's limited proxying capabilities. For a simpler tool and less advanced configuration options, please use FoxyProxy Basic.
Collector's Note Must have

Tamper Data by Adam Judson

Rated 4 out of 5 stars 115 reviews

138,338 users

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

ColorZilla by Alex Sirota

Rated 5 out of 5 stars 284 reviews

311,927 users

Advanced Eyedropper, Color Picker, Gradient Generator and other colorful goodies...

MeasureIt by Kevin Freitas

Rated 4 out of 5 stars 305 reviews

174,534 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 167 reviews

147,780 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.

FirePHP by cadorn

Rated 4 out of 5 stars 42 reviews

73,051 users

FirePHP enables you to log to your Firebug Console using a simple PHP method call.

Not using Firebug 1.9+ on Firefox 8+? See http://firephp.org/

SearchPreview by Edward Ackroyd

Rated 4 out of 5 stars 357 reviews

134,667 users

The extension previously known as GooglePreview. Inserts preview images (thumbnails) and popularity ranks of web sites into the Google, Yahoo, Bing and DuckDuckGo search results pages.

Html Validator by Marc Gueury

HTML Validator is a Mozilla extension that adds HTML validation inside Firefox and Mozilla. The number of errors of a HTML page is seen on the form of an icon

For Firefox 23+, you need 0.958 (under review)
http://users.skynet.be/mgueury/mozilla

Firefinder for Firebug by Robert Nyman

Rated 3 out of 5 stars 26 reviews

31,260 users

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

Firecookie by Jan Odvarko

Rated 4 out of 5 stars 57 reviews

7,209 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

Gmail Notifier by Doron Rosenberg

Rated 4 out of 5 stars 572 reviews

54,708 users

Note from Mozilla: This add-on has been discontinued. Try WebMail Notifier instead.

The original notifier for Gmail.

Source Viewer Tab by Piro (piro_or)

Rated 4 out of 5 stars 26 reviews

1,782 users

Shows web page sources in tab.
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