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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 (17,590)

7,986,946

#2, uBlock Origin

Raymond Hill

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

4.79 (17,590)

7,986,946

#3, uBlock Origin

Raymond Hill

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

4.79 (17,590)

7,986,946

#4, uBlock Origin

Raymond Hill

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

4.79 (17,590)

7,986,946

#5, uBlock Origin

Raymond Hill

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

4.79 (17,590)

7,986,946

#6, uBlock Origin

Raymond Hill

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

4.79 (17,590)

7,986,946

#7, Enhancer for YouTube™

Maxime RF

Take control of YouTube and boost your user experience!

4.71 (11,182)

579,356

#8, Russian spellchecking dictionary

Alexander Slovesnik

Russian spellchecking dictionary

4.77 (99)

282,837

#9, Google Translator for Firefox

nobzol

With this addon you can translate any text to your own language with one click or hot-key. You can either translate the selected text, this way the translated text will overwrite the original selected text, or you can translate the full page too.

3.40 (1,176)

236,245

#10, Browsing Protection by F-Secure

F-Secure

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

4.15 (263)

203,010

#11, 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)

193,600

#12, 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)

193,600

#13, 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)

193,600

#14, ColorZilla

Alex Sirota

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

4.02 (389)

154,401

#15, Dashlane Password Manager

Dashlane

Dashlane makes the internet easier. Save all your passwords, fill forms fast, and keep your data accessible and safe.

4.29 (561)

146,602

#16, Logitech Smooth Scrolling

Logitech

Logitech® Smooth Scrolling extension delivers smooth-as-smartphone scrolling in Firefox and works with most Logitech mice and touchpads — new and old. Requires Logitech SetPoint 6.60 and above and Windows 7 and above. Gaming mice not supported.

4.28 (758)

127,424

#17, VPN VeePN - Free VPN for Firefox

VeePN

Enjoy fast and secure free Firefox VPN Proxy extension. Unblock websites, protect your data, and browse freely – all at the highest connection speeds!

4.14 (615)

121,288

#18, Absolute Enable Right Click & Copy

Absolute

Force Enable Right Click & Copy

4.49 (681)

90,285

#19, Violentmonkey

Gerald

Userscript support for browsers, open source.

4.69 (618)

85,110

#20, Polish Spellchecker Dictionary

marcoos

Polish spell-check dictionary for Firefox, Thunderbird and SeaMonkey.

4.84 (51)

79,857

#21, Sidebery

mbnuqw

Vertical tabs tree and bookmarks in sidebar with advanced containers configuration, grouping and many other features.

4.71 (737)

78,558

#22, Proxy SwitchyOmega

Firefox user 12962115

Manage and switch between multiple proxies quickly & easily.

4.64 (544)

56,994

#23, Yandex.Bar

Yandex

Advanced toolbar for Firefox

2.27 (257)

55,881

#24, Ruffle - Flash Emulator

Ruffle

Putting Flash back on the web. Designed to be easy to use, this extension will seamlessly enable you to play flash content, with no extra configuration required!

4.72 (123)

49,721

#25, Proton Pass

Proton

Free and unlimited password manager to keep your login credentials safe and manage them directly in your browser.

4.48 (602)

48,565