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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, Activist – Balanced

Mozilla Firefox

You leave the world a better place than you found it and lead others to believe.

4.81 (84)

843,769

#2, Visionary – Balanced

Mozilla Firefox

You question the status quo and move others to imagine a better future.

4.59 (41)

555,047

#3, Dreamer – Balanced

Mozilla Firefox

You believe that fortune favors the bold and inspire others to be brave.

4.82 (39)

487,187

#4, Firefox Translations

Mozilla Firefox

Translate websites in your browser, privately, without using the cloud. The functionality from this extension is now integrated into Firefox.

3.64 (913)

334,178

#5, Expressionist – Balanced

Mozilla Firefox

You see the world differently and your creations stir the emotions of others.

4.67 (12)

294,312

#6, Innovator – Balanced

Mozilla Firefox

You see opportunities everywhere and make an impact on the lives of everyone around you.

4.58 (12)

250,910

#7, Innovator – Balanced

Mozilla Firefox

You see opportunities everywhere and make an impact on the lives of everyone around you.

4.58 (12)

250,910

#8, Innovator – Balanced

Mozilla Firefox

You see opportunities everywhere and make an impact on the lives of everyone around you.

4.58 (12)

250,910

#9, Playmaker – Balanced

Mozilla Firefox

You create opportunities to win and help everyone around you elevate their game.

3.33 (6)

247,039

#10, Lush – Soft

Mozilla Firefox

Life is better in color. Make your browsing a little more joyful and vibrant.

4.43 (21)

239,844

#11, Dreamer – Bold

Mozilla Firefox

You believe that fortune favors the bold and inspire others to be brave.

4.81 (27)

174,787

#12, Activist – Bold

Mozilla Firefox

You leave the world a better place than you found it and lead others to believe.

4.59 (32)

168,724

#13, Graffiti – Soft

Mozilla Firefox

Life is better in color. Make your browsing a little more joyful and vibrant.

4.81 (16)

154,569

#14, Foto – Soft

Mozilla Firefox

Life is better in color. Make your browsing a little more joyful and vibrant.

4.78 (18)

154,514

#15, Elemental – Soft

Mozilla Firefox

Life is better in color. Make your browsing a little more joyful and vibrant.

4.00 (19)

143,638

#16, ESET Browser Privacy & Security

ESET

Enjoy extended browser protection with ESET Browser Privacy & Security—includes the unique Metadata Cleanup, Secure Search and more.

4.39 (69)

143,567

#17, English (US) Dictionary

flod

English (US) dictionary based on the official Mozilla dictionary.

4.32 (19)

132,620

#18, Cheers – Soft

Mozilla Firefox

Life is better in color. Make your browsing a little more joyful and vibrant.

4.50 (6)

124,055

#19, Visionary – Bold

Mozilla Firefox

You question the status quo and move others to imagine a better future.

4.82 (22)

112,307

#20, Abstract – Soft

Mozilla Firefox

Life is better in color. Make your browsing a little more joyful and vibrant.

4.33 (6)

106,021

#21, Playmaker – Bold

Mozilla Firefox

You create opportunities to win and help everyone around you elevate their game.

4.44 (9)

89,200

#22, Custom Search Tool

Custom Search Tool

Get a custom search tool powered by Yahoo!

5.00 (1)

76,677

#23, Innovator – Bold

Mozilla Firefox

You see opportunities everywhere and make an impact on the lives of everyone around you.

4.63 (8)

65,395

#24, I still don't care about cookies

Guus

Community version of the popular extension "I don't care about cookies" https://github.com/OhMyGuus/I-Dont-Care-About-Cookies

4.86 (306)

63,514

#25, Lush – Bold

Mozilla Firefox

Life is better in color. Make your browsing a little more joyful and vibrant.

4.50 (10)

59,289