5-21-12

by tiffany may

40 Add-ons in this Collection

Video DownloadHelper by mig

Rated 4 out of 5 stars 5,543 reviews

4,568,729 users

The easy way to download and convert Web videos from hundreds of YouTube-like sites.

Firebug by Joe Hewitt, Jan Odvarko, others

Rated 5 out of 5 stars 1,783 reviews

2,245,657 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 956 reviews

1,225,396 users

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

User Agent Switcher by chrispederick

Rated 4 out of 5 stars 248 reviews

363,457 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 216 reviews

535,299 users

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

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

Rated 5 out of 5 stars 432 reviews

254,652 users

FireShot Webpage Screenshots captures pages entirely. Demo: http://bit.ly/RlBQMV

Screenshots can be quickly captured and:

― Saved as Image or PDF
― Sent to clipboard
― Printed
― Annotated *
― Uploaded *
― E-Mailed *

* OS Windows only

Tamper Data by Adam Judson

Rated 4 out of 5 stars 130 reviews

111,676 users

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

Xmarks Sync by Xmarks Inc.

Rated 4 out of 5 stars 2,514 reviews

302,171 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!

ColorZilla by Alex Sirota

Rated 5 out of 5 stars 302 reviews

272,321 users

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

JavaScript Debugger by James Ross, Robert Ginda, others

Rated 4 out of 5 stars 50 reviews

130,319 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.

MeasureIt by Kevin Freitas

Rated 4 out of 5 stars 333 reviews

143,395 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 161 reviews

94,550 users

An HTTP analyzer addon for Firefox

YSlow by YSlow

Rated 3 out of 5 stars 192 reviews

100,541 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 328 reviews

120,505 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.

Html Validator by Marc Gueury

Rated 5 out of 5 stars 198 reviews

56,361 users

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 Online HTML 5 validation, you need 0.962
http://users.skynet.be/mgueury/mozilla
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