5-21-12

by tiffany may

41 Add-ons in this Collection

Video DownloadHelper by mig

Rated 4 out of 5 stars 4,150 reviews

6,397,039 users

The easy way to download and convert Web videos from hundreds of YouTube-like sites.
This works also for audio and picture galleries.

Firebug by Joe Hewitt, Jan Odvarko, others

Rated 5 out of 5 stars 1,623 reviews

2,831,806 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...

Greasemonkey by Anthony Lieuallen, Aaron Boodman, others

Rated 4 out of 5 stars 854 reviews

1,799,852 users

Customize the way a web page displays or behaves, by using small bits of JavaScript.

Web Developer by chrispederick

Rated 5 out of 5 stars 178 reviews

761,635 users

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

User Agent Switcher by chrispederick

Rated 4 out of 5 stars 195 reviews

449,303 users

The User Agent Switcher extension adds a menu and a toolbar button to switch the user agent of a browser.

Xmarks Sync by Xmarks Inc.

Rated 4 out of 5 stars 2,319 reviews

508,036 users

Xmarks is the #1 bookmarking and open tab add-on. Keep your bookmarks, and open tabs backed up and synchronized across computers and browsers. Mobile phones with Premium access. Utilize LastPass to sync passwords!

Webpage Screenshot in Firefox (♥♥♥♥♥) by susbox

Rated 5 out of 5 stars 374 reviews

283,673 users

FireShot Webpage Screenshots captures webpage screenshot entirely (see demo: http://bit.ly/RlBQMV)

The screenshot can be quickly annotated and:

+ Uploaded
+ Saved as PDF/PNG/GIF/JPEG/BMP
+ Sent to clipboard
+ Printed
+ E-Mailed
+ Exported

ColorZilla by Alex Sirota

Rated 5 out of 5 stars 282 reviews

335,121 users

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

Tamper Data by Adam Judson

Rated 4 out of 5 stars 112 reviews

138,744 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 48 reviews

248,644 users

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

MeasureIt by Kevin Freitas

Rated 4 out of 5 stars 303 reviews

166,855 users

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

HttpFox by Martin Theimer

Rated 4 out of 5 stars 149 reviews

112,532 users

An HTTP analyzer addon for Firefox

YSlow by YSlow

Rated 3 out of 5 stars 164 reviews

144,779 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.

Memory Fox by IDEVFH

Rated 4 out of 5 stars 257 reviews

164,147 users

Attempting to reduce both Browser and Flash RAM Memory usage. Memory Fox will promote the increase of available RAM memories for other application processes. Hopefully, fostering any attempts of Memory Recovery and Retention.

CodeBurner for Firebug by SitePoint

Rated 3 out of 5 stars 32 reviews

56,479 users

CodeBurner is a Firefox add-on that integrates with Firebug, to extend it with reference material for HTML and CSS.
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