Add-ons for Firefox

Add on style. Add on function. Add features to Firefox.
Choose from 5000 free extras to make your browser look and function the way you want.
An add-on can be a new time-saving toolbar button, a shortcut to search, a themed look, and more. Add-ons make browsing easier.
Choose add-ons for the way you browse. Install in a few clicks and they stay up to date with easy reminders. Explore and add on now!
Build the perfect website

Web Developer
The Web Developer extension adds a menu and a toolbar with various web...
Download Now recommended

Greasemonkey

Allows you to customize the way a webpage displays using small bits of...

Download Now recommended

Tamper Data

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

Download Now recommended

Get the latest scores and highlights

Research anything online

Answers

1-Click Answers TM will save you even more time with AnswerTips that...

Download Now recommended

Wired-Marker

Wired-Marker(http://www.wired-marker.org/en/) is a permanent...

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Read It Later

Read It Later allows you to save pages of interest to read later. It...

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Like these? Find more add-ons in the Reference Desk collection.

Get the most out of your money

Amazon Button

Our users say "A must have for Amazon Shoppers". Easily navigate...

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InvisibleHand

Automatically shows a discreet notification when a better price is available...

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Woot Watcher

Woot Watcher monitors the Woot! web site, and keeps you updated with the...

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Like these? Find more add-ons in the Online Shopping collection.

Plan business trips and unforgettable vacations

Lonely Planet

Search through Lonely Planet's travel guides.

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Yapta

Comparison shop for the best fares on airline websites. Yapta will track...

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Flagfox

Displays a country flag depicting the location of the current website's...

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Like these? Find more add-ons in the Traveler's Pack collection.

Browse Add-ons

Download Now recommended

Download Manager Tweak by squashr1979, andman42

Allows the download manager to also open in a tab or sidebar, and adds some optional display changes.

Rated 5 out of 5 stars 125 reviews 56,795 weekly downloads Updated October 31, 2009

Download Now recommended

ImTranslator by Smart Link Corporation

ImTranslator includes Online Translator in 1640 language combinations for Albanian, Arabic, Bulgarian, Catalan, Chinese (Simp.), Chinese (trad.), Croatian, Czech, Danish, Dutch, English, Estonian, Filipino, Finnish, French, Galician, German, Greek, ...

Rated 4 out of 5 stars 119 reviews 95,297 weekly downloads Updated July 31, 2009

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Download Now recommended

Multiple Tab Handler by Piro (piro_or)

Provides feature to close multiple tabs.

Rated 5 out of 5 stars 54 reviews 42,396 weekly downloads Updated November 4, 2009

Download Now (Windows)recommended

FireShot by susbox

FireShot is a Firefox extension that creates screenshots of web pages (entirely or just visible part).

Unlike other extensions, this plugin provides a set of editing and annotation tools, which let users quickly modify web captures and ...

Rated 5 out of 5 stars 255 reviews 55,302 weekly downloads Updated October 12, 2009

Download Now recommended

QuickDrag by Kai Liu

Extends the function of the drag-and-drop mouse gesture so that it can be used to load URLs, do a web search of selected text on a page, or save an image on a page. The successor to Super DragAndGo.

Rated 5 out of 5 stars 87 reviews 15,539 weekly downloads Updated May 7, 2009

Collections

Collections are a way for you to categorize, mix, match and mingle add-ons. Subscribe to collections created by other users or create your own.

Popular Collections

Windows 7 Theme for Firefox 3.5 by Enkei

Seamlessly Perfect Windows 7 Theme for Firefox 3.5 - Google Tweaked - Time Conserving add-ons (skip screen, showcase, smarterfox) - Stylish Add-on with Styles list!

11 add-ons 23429 subscribers

Web Developer's Toolbox by Mozilla

Speed up the development process by using add-ons to troubleshoot, edit, and debug web projects without ever clicking away from Firefox.

12 add-ons 7062 subscribers

Reference Desk by Mozilla

Make the librarian jealous with add-ons that help students, researchers or anyone with a tough question find and document all the answers.

13 add-ons 4390 subscribers

Lifehacker's Must-Have Extensions by Lifehacker.Addons

Ten broadly useful extensions, as detailed at: http://bit.ly/10Xxc (There are technically 10, but Gears can't be installed from Mozilla's site)

9 add-ons 3527 subscribers

Better Pack by Lifehacker.Addons

Lifehacker's "Better" add-ons, compiling multiple Greasemonkey tweaks for YouTube, Reader, Gmail, Google Calendar, Flickr, and other sites.

6 add-ons 2380 subscribers

View All Collections

Categories

Most Shared Add-ons (Last 7 Days)

Build a Firefox Add-on

Add on style. Add on function. Add features to Firefox.

Build the perfect website

Web Developer

Greasemonkey

Tamper Data

Get the latest scores and highlights

Baseball Boom! - follow your favorite MLB team

Fantasy Football Rankings and News

Pro Football Toolbar and Theme - follow your favorite NFL team

Research anything online

Answers

Wired-Marker

Read It Later

Get the most out of your money

Amazon Button

InvisibleHand

Woot Watcher

Plan business trips and unforgettable vacations

Lonely Planet

Yapta

Flagfox

Browse Add-ons

Download Manager Tweak by squashr1979, andman42

ImTranslator by Smart Link Corporation

Multiple Tab Handler by Piro (piro_or)

FireShot by susbox

QuickDrag by Kai Liu

Collections

Popular Collections

Windows 7 Theme for Firefox 3.5 by Enkei

Web Developer's Toolbox by Mozilla

Reference Desk by Mozilla

Lifehacker's Must-Have Extensions by Lifehacker.Addons

Better Pack by Lifehacker.Addons