28 Add-ons in this Collection

Adblock Plus by Wladimir Palant

Rated 5 out of 5 stars 4,979 reviews

21,264,596 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 1,793 reviews

2,211,735 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...

DownThemAll! by Nils Maier, Federico Parodi, others

Rated 5 out of 5 stars 1,612 reviews

1,366,719 users

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

ColorZilla by Alex Sirota

Rated 5 out of 5 stars 305 reviews

296,008 users

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

United States English Spellchecker by jooliaan

Rated 3 out of 5 stars 165 reviews

494,874 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)".

Tamper Data by Adam Judson

Rated 4 out of 5 stars 132 reviews

113,718 users

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

Xmarks Sync by Xmarks Inc.

Rated 4 out of 5 stars 2,516 reviews

314,905 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 877 reviews

380,781 users

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

MeasureIt by Kevin Freitas

Rated 4 out of 5 stars 339 reviews

153,702 users

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

Password Exporter by Justin Scott (fligtar), Jorge Villalobos

Rated 4 out of 5 stars 321 reviews

187,985 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 1,191 reviews

251,768 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 157 reviews

169,414 users

View HTTP headers of a page and while browsing.

FEBE by Chuck_Baker

Rated 4 out of 5 stars 640 reviews

126,446 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

21,984 users

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