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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.

1,286 results. Page 1 of 52.

#1, AdBlocker Ultimate

AdAvoid

Completely remove ALL ads. No “acceptable” ads or whitelisted advertisers allowed. This free extensions also helps block trackers and malware.

4.78 (24,453)

2,242,725

#2, Privacy Badger

EFF Technologists

Automatically learns to block invisible trackers.

4.80 (2,429)

1,220,534

#3, AdBlocker for YouTube™

AdblockLite

Remove all annoying ads from YouTube.

4.04 (1,048)

463,555

#4, Rakuten: Get Cash Back For Shopping

Rakuten

Start shopping smarter with Cash Back and coupons. By clicking Add to Firefox you agree to the Rakuten Extension Terms & Conditions

4.50 (850)

153,423

#5, Wappalyzer

Wappalyzer

Identify technologies on websites

4.39 (479)

119,665

#6, Stylus

Stylus Team

Redesign your favorite websites with Stylus, an actively developed and community driven userstyles manager. Easily install custom themes from popular online repositories, or create, edit, and manage your own personalized CSS stylesheets.

4.68 (1,018)

109,934

#7, Disconnect

Disconnect

Make the web faster, more private, and more secure.

4.14 (479)

95,079

#8, 360 Internet Protection

360 Total Security

This extension is web threat protection of 360 Total Security for Firefox. It identifies malicious URL in real-time and blocks web threats. The capabilities of anti-fraud, anti-phishing and anti-malicious URL will be enabled once installed.

4.52 (2,130)

76,700

#9, AdNauseam

Daniel Howe

Blocking ads and fighting back against advertising surveillance.

4.59 (548)

68,777

#10, New Tab Override

Sören Hentzschel

New Tab Override allows you to set the page that shows whenever you open a new tab.

4.35 (961)

64,199

#11, Clear Cache

TenSoja

Clear browser cache with a single click or via the F9 key. F9 Fever! ;)

4.43 (258)

62,363

#12, Cookie-Editor

cgagnier

Cookie-Editor lets you efficiently create, edit and delete a cookie for the current tab. Perfect for developing, quickly testing or even manually managing your cookies for your privacy.

4.18 (158)

61,912

#13, Popup Blocker (strict)

Jeremy Schomery

Strictly block all popup requests from any website by default. A notification window is opened to allow you accept, reject, open the popup in background page, or redirect the current page to popup address

4.21 (456)

61,314

#14, Shinigami Eyes

Shinigami Eyes

Highlights transphobic/anti-LGBT and trans-friendly subreddits/facebook pages/groups with different colors. Supports Reddit, Twitter, Facebook, Tumblr, Medium, YouTube, Wikipedia, search engine results and all sites with Disqus comments.

4.40 (389)

51,217