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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, DuckDuckGo Privacy Essentials

DuckDuckGo

Simple and seamless privacy protection for your browser: tracker blocking, cookie protection, DuckDuckGo private search, email protection, HTTPS upgrading, and much more.

4.36 (2,122)

1,562,038

#2, Privacy Badger

EFF Technologists

Automatically learns to block invisible trackers.

4.80 (2,429)

1,242,791

#3, AdBlock for Firefox

AdBlock

The most popular ad blocker for Chrome and Safari, now available for Firefox! Block all advertisements on all web pages, even Facebook, Youtube, and Hulu. Browse faster, too! Most ads aren't even downloaded at all, saving you time and bandwidth.

4.29 (3,227)

1,215,280

#4, Dark Reader

Dark Reader Ltd

Dark mode for every website. Take care of your eyes, use dark theme for night and daily browsing.

4.53 (5,597)

1,177,534

#5, AdGuard AdBlocker

Adguard Software Ltd

Unmatched adblock extension against advertising and pop-ups. Blocks ads on Facebook, Youtube and all other websites.

4.69 (5,691)

1,067,095

#6, Ghostery – Privacy Ad Blocker

Ghostery

Ghostery is a powerful privacy extension. Block ads, stop trackers and speed up websites.

4.30 (4,174)

1,052,969

#7, 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.

4.06 (3,474)

1,031,436

#8, Facebook Container

Mozilla Firefox

Prevent Facebook from tracking you around the web. The Facebook Container extension for Firefox helps you take control and isolate your web activity from Facebook.

4.45 (3,961)

1,000,518

#9, Language: Deutsch (German)

Mozilla Firefox

Firefox Language Pack for Deutsch (de) – German

4.14 (1,113)

992,742

#10, Language: Français (French)

Mozilla Firefox

Firefox Language Pack for Français (fr) – French

4.15 (1,169)

956,431

#11, Language: Français (French)

Mozilla Firefox

Firefox Language Pack for Français (fr) – French

4.15 (1,169)

956,431

#12, 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 (4,317)

826,525

#13, Grammarly: AI Writing and Grammar Checker App

Grammarly

Improve your writing with Grammarly's assistance. Get spell check, grammar check, and punctuation check in one tool. Real-time suggestions for improving tone and clarity help ensure your writing makes the impression you want.

4.11 (2,980)

817,564

#14, Bitwarden Password Manager

Bitwarden Inc.

At home, at work, or on the go, Bitwarden easily secures all your passwords, passkeys, and sensitive information.

4.76 (7,904)

749,326

#15, IDM Integration Module

Internet Download Manager, Tonec Inc.

Download files with Internet Download Manager

4.55 (2,900)

715,412

#16, Tampermonkey

Jan Biniok

Tampermonkey is the world's most popular userscript manager.

4.70 (4,725)

689,791

#17, TWP - Translate Web Pages

Filipe Dev

Translate your page in real time using Google or Yandex. It is not necessary to open new tabs. Now works with the NoScript Extension.

4.79 (3,159)

672,909

#18, Return YouTube Dislike

Dmitry Selivanov

Returns ability to see dislike statistics on youtube

4.73 (4,063)

666,431

#19, LastPass Password Manager

LastPass

LastPass, an award-winning password manager, saves your passwords and gives you secure access from every computer and mobile device.

3.68 (8,466)

562,082

#20, Browsec VPN - Free VPN for Firefox

Browsec Inc

Unblock geographically restricted content and protect your IP with Browsec’s add-on. With this Firefox VPN, you can stay anonymous for an unlimited time! Use free remote servers to hide your location and access any content you want.

4.01 (2,782)

487,588

#21, MetaMask

danfinlay

Ethereum Browser Extension

4.27 (3,930)

485,816

#22, AdBlocker for YouTube™

AdblockLite

Remove all annoying ads from YouTube.

4.04 (1,048)

474,901

#23, Kaspersky Protection 2021

Kaspersky

Your protection on the Internet with extension from Kaspersky Lab

4.61 (4,733)

467,747

#24, SaveFrom.net helper all-in-1 / youtube downloader

savefrom

SaveFrom.net helper will enable you to download files from YouTube.com, FaceBook.com, Vimeo.com, Daylimotion.com, VK.com, Odnoklassnoki.ru, Soundcloud.com and more than 40 other just in one click.

4.21 (3,375)

453,731

#25, SponsorBlock - Skip Sponsorships on YouTube

Ajay (SponsorBlock)

Easily skip YouTube video sponsors. When you visit a YouTube video, the extension will check the database for reported sponsors and automatically skip known sponsors. You can also report sponsors in videos. Other browsers: https://sponsor.ajay.app

4.80 (2,280)

445,059