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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, uBlock Origin

Raymond Hill

Finally, an efficient wide-spectrum content blocker. Easy on CPU and memory.

4.79 (17,611)

7,836,693

#2, uBlock Origin

Raymond Hill

Finally, an efficient wide-spectrum content blocker. Easy on CPU and memory.

4.79 (17,611)

7,836,693

#3, uBlock Origin

Raymond Hill

Finally, an efficient wide-spectrum content blocker. Easy on CPU and memory.

4.79 (17,611)

7,836,693

#4, uBlock Origin

Raymond Hill

Finally, an efficient wide-spectrum content blocker. Easy on CPU and memory.

4.79 (17,611)

7,836,693

#5, uBlock Origin

Raymond Hill

Finally, an efficient wide-spectrum content blocker. Easy on CPU and memory.

4.79 (17,611)

7,836,693

#6, uBlock Origin

Raymond Hill

Finally, an efficient wide-spectrum content blocker. Easy on CPU and memory.

4.79 (17,610)

7,836,693

#7, Adblock Plus

Adblock Plus

One of the most popular free ad blockers for Firefox. Block annoying ads on sites like Facebook, YouTube and all other websites. Adblock Plus blocks all annoying ads, and supports websites by not blocking unobtrusive ads by default (configurable).

4.44 (10,533)

3,768,059

#8, AdGuard AdBlocker

Adguard Software Ltd

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

4.69 (5,685)

1,056,180

#9, Ghostery – Privacy Ad Blocker

Ghostery

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

4.30 (4,173)

1,040,873

#10, 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 (2,978)

795,273

#11, 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 (7,902)

728,931

#12, Easy Youtube Video Downloader Express

Dishita

A simple extension for superfast and easy YouTube downloads in FLV, 3GP, MP3, MP4, 720p, and 1080p formats.

4.23 (15,179)

580,885

#13, Capital One Shopping: Save Now

Capital One Shopping

Capital One Shopping instantly applies coupon codes to your shopping cart, helps you snag exclusive rewards when you shop at stores you love and compares prices on Amazon to other popular retailers. It's kinda genius.

4.46 (638)

559,810

#14, Malwarebytes Browser Guard

Malwarebytes

The fastest and safest web browsing experience. Secure your privacy by blocking trackers, blocking ads, and blocking malicious content.

4.29 (706)

514,606

#15, 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 (2,780)

477,446

#16, Kaspersky Protection 2021

Kaspersky

Your protection on the Internet with extension from Kaspersky Lab

4.61 (4,729)

454,870

#17, 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 (3,372)

440,898

#18, 1Password: Password Manager

1Password

The best way to experience 1Password in your browser. Easily sign in to sites, generate passwords, and store secure information, including logins, credit cards, notes, and more.

3.86 (1,413)

326,713

#19, Reddit Enhancement Suite

honestbleeps

Reddit Enhancement Suite (RES) is a suite of tools to enhance your Reddit browsing experience.

4.81 (554)

276,195

#20, Tree Style Tab

Piro (piro_or)

Show tabs like a tree.

4.54 (2,000)

209,039

#21, Keepa.com - Amazon Price Tracker

Keepa.com

→ Price History charts → Price Drop & Availability Alerts → Over 1 billion tracked products → Supports Amazon .com | .co.uk | .de | .co.jp | .fr | .ca | .it | .es | .in | .mx

4.41 (510)

208,539

#22, Browsing Protection by F-Secure

F-Secure

Extension for protecting encrypted browsing with security products by F-Secure.

4.15 (263)

193,262

#23, React Developer Tools

React

React Developer Tools is a tool that allows you to inspect a React tree, including the component hierarchy, props, state, and more. To get started, just open the Firefox devtools and switch to the "⚛️ Components" or "⚛️ Profiler" tab.

4.64 (343)

187,380

#24, React Developer Tools

React

React Developer Tools is a tool that allows you to inspect a React tree, including the component hierarchy, props, state, and more. To get started, just open the Firefox devtools and switch to the "⚛️ Components" or "⚛️ Profiler" tab.

4.64 (343)

187,380

#25, React Developer Tools

React

React Developer Tools is a tool that allows you to inspect a React tree, including the component hierarchy, props, state, and more. To get started, just open the Firefox devtools and switch to the "⚛️ Components" or "⚛️ Profiler" tab.

4.64 (343)

187,380