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Add-ons (also known as extensions) are small programs that run inside web browsers like Mozilla Firefox. They add extra features to the browser without having to download anything new. You can use extensions to make browsing faster, easier, and safer. Some extensions even let you do things like translate text on websites, search the web, and play games.

There are over 28,000 Firefox-addons and 480,000 themes, making it hard to find the best ones. so we have created a way to sort through all of them. Use the dropdown above to set different filters. Add-ons are sorted by number of active users.

To set even more advanced filters, and sort the Firefox add-ons differently, please visit our Advanced search tool. Note that Advanced search tool is only available to premium members.

#1, To Google Translate

Juan Escobar

Right-click a section of text and click the Translate icon next to it to text translate or listen to it in your language.

4.07 (3,472)

1,023,544

#2, Honey

Honey

Automatically find and try coupon codes with 1-click. Works at thousands of stores in the US, Canada, Australia, India and the UK.

4.51 (4,316)

815,473

#3, French spelling dictionary

Olivier R.

Spelling dictionary for the French language.

4.35 (205)

298,253

#4, French spelling dictionary

Olivier R.

Spelling dictionary for the French language.

4.35 (205)

298,253

#5, French spelling dictionary

Olivier R.

Spelling dictionary for the French language.

4.35 (205)

298,253

#6, Pinterest Save Button

Pinterest, Inc.

Save your favorite ideas online so you can easily get back to them later.

3.42 (454)

176,801

#7, Maps Assist & Custom Web Search

MapsAssist

Install the Maps Assist & Custom Web Search extension to get directions by clicking the favicon on the toolbar & enjoy Yahoo® search from your browser.

2.75 (4)

162,024

#8, Belgium eID

BOSA

Use the Belgian electronic identity card (eID) in Firefox

3.32 (1,630)

159,721

#9, YouTube Video and Audio Downloader (WebEx)

feller

Download YouTube videos in all available formats and extract the original audio files

3.85 (1,739)

139,033

#10, EPUBReader

epubreader

Read ePub files right in Firefox. No additional software needed!

3.67 (341)

134,022

#11, Firefox Color

Mozilla Firefox

Build, save and share beautiful Firefox themes.

4.40 (1,293)

118,630

#12, Google Scholar Button

Alex Verstak, Google

Lookup scholarly articles as you browse the web.

4.47 (208)

110,742

#13, Avira Browser Safety

Avira

Avira Browser Safety helps identify internet addresses that are harmful to your system when you are browsing the web and protects your privacy by preventing invisible trackers.

4.49 (438)

110,590

#14, Video Speed Controller

codebicycle

Speed up, slow down, advance and rewind any HTML5 video with quick shortcuts.

4.56 (695)

97,786

#15, Citavi Picker

Citavi Team

The Citavi Picker is an extension for Citavi software users (www.citavi.com). The Citavi Picker lets you easily import online information.

3.89 (19)

97,232

#16, Web Developer

chrispederick

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

4.27 (472)

91,888

#17, Free Download Manager official extension

freedownloadmanager.org

Free Download Manager integration with your Firefox browser

4.21 (651)

89,439

#18, Package Tracking Tab & Custom Web Search

PackageTrackingTab

Add the Package Tracking Tab & Custom Web Search extension to track packages online by clicking the favicon on the toolbar & enjoy access to Yahoo® search from your browser.

3.50 (2)

85,388

#19, YouTube Video Download - YouTube HD Download

YouTube Video Downloader 1-Click Group

Download YouTube Videos in HD + SOUND. YouTube Video Download - YouTube HD Download is an amazing YouTube Video Downloader tool for all the download video YouTube fans. Download YouTube video with YouTube Video Download!

3.63 (1,139)

84,451

#20, Privacy Possum

cowlicks

Privacy Possum monkey wrenches common commercial tracking methods by reducing and falsifying the data gathered by tracking companies.

4.38 (407)

74,346

#21, Tabliss - New Tab

tabliss.io

A beautiful New Tab page with many customisable backgrounds and widgets that does not require any permissions.

4.64 (2,180)

73,150

#22, AVG Online Security

AVG Technologies

AVG Browser Security and Web Reputation Plugin. Offering protection against known phishing and malware sites, improving your browsing overall browsing experience with crowd sourced web reputation rating.

4.52 (687)

71,720

#23, Download Video and Flash - HD Download

Download Flash and Video Team

Download Video and Flash - HD Download is a great download helper tool that lets you download video and Flash games very easily. Download from YouTube, Facebook, Dailymotion, Vimeo and more. Download and enjoy! Download now!

3.77 (595)

68,986

#24, Plasma Integration

KDE

Multitask efficiently by controlling browser functions from the Plasma desktop.

4.69 (434)

67,915

#25, Dizionario italiano

flod

Add support for Italian to spellchecking

4.67 (75)

65,211