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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.

11,320 results. Page 1 of 453.

#1, Easy Screenshot

Mozilla Online

Capture a screenshot of the whole webpage, and save in your desktop in default.

3.89 (708)

3,318,880

#2, Cisco Webex Extension

Cisco WebEx

Join Webex meetings using Firefox ™

2.88 (313)

976,219

#3, Activist – Balanced

Mozilla Firefox

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

4.81 (84)

797,243

#4, Visionary – Balanced

Mozilla Firefox

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

4.60 (42)

521,390

#5, Dreamer – Balanced

Mozilla Firefox

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

4.82 (39)

458,619

#6, Ecosia — The search engine that plants trees 🌱

Ecosia Dev Team

This extension adds Ecosia.org as the default search engine to your browser — it’s completely free!

4.80 (724)

318,478

#7, Expressionist – Balanced

Mozilla Firefox

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

4.67 (12)

276,468

#8, German Dictionary

KaiRo

German Dictionary (new Orthography) for spellchecking in Firefox

4.36 (100)

250,751

#9, Cookie AutoDelete

CAD Team

Control your cookies! This WebExtension is inspired by Self Destructing Cookies. When a tab closes, any cookies not being used are automatically deleted. Keep the ones you trust (forever/until restart) while deleting the rest. Containers Supported

4.58 (1,447)

238,320

#10, Innovator – Balanced

Mozilla Firefox

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

4.58 (12)

236,108

#11, Innovator – Balanced

Mozilla Firefox

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

4.58 (12)

236,108

#12, Innovator – Balanced

Mozilla Firefox

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

4.58 (12)

236,108

#13, Playmaker – Balanced

Mozilla Firefox

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

3.33 (6)

232,425

#14, Lush – Soft

Mozilla Firefox

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

4.45 (22)

223,317

#15, ClearURLs

Kevin R.

Removes tracking elements from URLs

4.44 (781)

213,416

#16, German Dictionary (Switzerland)

KaiRo

Dictionary with Swiss variants of German words for spellchecking in Firefox.

4.64 (14)

192,097

#17, German Dictionary, extended for Austria

KaiRo

German dictionary ("new" orthography) for spellchecking in Firefox, extended with Austrian words

4.57 (14)

191,644

#18, Avast Online Security & Privacy

AVAST Software

Secure your Mozilla Firefox browser against real-time online threats, trackers, and scams. We’ll check every site you visit, from Facebook to your bank, so nothing puts you or your data at risk. Join a growing community of 400 million Avast users.

4.48 (1,607)

183,999

#19, Dreamer – Bold

Mozilla Firefox

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

4.82 (28)

168,639

#20, Activist – Bold

Mozilla Firefox

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

4.59 (32)

162,498

#21, GNOME Shell integration

Yuri Konotopov

This extension provides integration with GNOME Shell and the corresponding extensions repository https://extensions.gnome.org

4.30 (254)

155,604

#22, iCloud Bookmarks

Apple Inc.

Keep your Firefox bookmarks on Windows up to date with your Safari bookmarks on iPhone, iPad, and Mac with the iCloud Bookmarks extension for Firefox.

4.18 (3,613)

153,805