28 Add-ons in this Collection

Adblock Plus by Wladimir Palant

Rated 5 out of 5 stars 4,991 reviews

23,439,654 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 1,800 reviews

2,704,207 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...
Collector's Note STU - PEN - DO!!!

DownThemAll! by Nils Maier, Federico Parodi, others

Rated 5 out of 5 stars 1,626 reviews

1,483,902 users

The first and only download manager/accelerator built inside Firefox!

Tamper Data by Adam Judson

Rated 4 out of 5 stars 133 reviews

130,040 users

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

United States English Spellchecker by jooliaan

Rated 3 out of 5 stars 166 reviews

567,294 users

United States English Spellchecker for Firefox, Thunderbird and SeaMonkey by Kevin Atkinson and Geoff Kuenning.

To enable, right-click in a multi-line text box, select "Languages", then "English (United States)".

Xmarks Sync by Xmarks Inc.

Rated 4 out of 5 stars 2,528 reviews

342,300 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!

FireGestures by Gomita

Rated 4 out of 5 stars 887 reviews

404,263 users

A customizable mouse gestures extension which enables to execute various commands and user scripts with six types of gestures.

ColorZilla by Alex Sirota

Rated 5 out of 5 stars 306 reviews

339,959 users

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

Password Exporter by Justin Scott (fligtar), Jorge Villalobos

Rated 4 out of 5 stars 325 reviews

209,191 users

This extension allows you to export your saved passwords and disabled login hosts using XML or CSV files that can be imported later.

IE Tab by PCMan, yuoo2k

Rated 4 out of 5 stars 1,194 reviews

285,511 users

IE Tab - an extension from Taiwan, features: Embedding Internet Explorer in tabs of Mozilla/Firefox...

Live HTTP Headers by Daniel Savard, Nikolas Co

Rated 4 out of 5 stars 159 reviews

186,874 users

View HTTP headers of a page and while browsing.

MeasureIt by Kevin Freitas

Rated 4 out of 5 stars 341 reviews

179,116 users

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

FEBE by Chuck_Baker

Rated 4 out of 5 stars 644 reviews

133,239 users

FEBE (Firefox Environment Backup Extension) allows you to quickly and easily backup your Firefox extensions. In fact, it goes beyond just backing up -- It will actually rebuild your extensions individually into installable .xpi files.

Firefinder for Firebug by Robert Nyman

Rated 3 out of 5 stars 28 reviews

26,403 users

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