Most Popular Extensions

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Adblock Plus

Blocks annoying video ads on YouTube, Facebook ads, banners and much more.

Adblock Plus blocks all annoying ads, and supports websites by not blocking unobtrusive ads by default (configurable).

Rated 5 out of 5 stars (5,807)
14,141,351 users

uBlock Origin Compatible with Firefox 57+ Featured

Finally, an efficient blocker. Easy on CPU and memory.

Rated 5 out of 5 stars (2,857)
3,903,520 users

Flash Video Downloader - YouTube HD Download [4K]

Flash Video Downloader helps you download any video (flv, mp4, HD) from YouTube, Facebook, Break, Metacafe and more in one click. You can download mp3, music (iPod), avi and more. Download Flash games. Download Helper. 4K download.

Rated 4 out of 5 stars (2,826)
738,723 users

LastPass Password Manager

LastPass, an award-winning password manager, saves your passwords and gives you secure access from every computer and mobile device.

Rated 4 out of 5 stars (2,479)
649,211 users

AdBlock for Firefox Compatible with Firefox 57+

The most popular ad blocker for Chrome and Safari, now available for Firefox! Block all advertisements on all web pages, even Facebook, Youtube, and Hulu. Browse faster, too! Most ads aren't even downloaded at all, saving you time and bandwidth.

Rated 4 out of 5 stars (302)
608,374 users

Yandex.Bar Compatible with Firefox 57+

Advanced toolbar for Firefox

Rated 2 out of 5 stars (382)
540,603 users

Grammarly for Firefox Compatible with Firefox 57+

Grammarly will help you communicate more effectively. As you type, Grammarly flags mistakes and helps you make sure your messages, documents, and social media posts are clear, mistake-free, and impactful.

Rated 4 out of 5 stars (226)
446,736 users

AdBlocker Ultimate Compatible with Firefox 57+

Free and improved ad blocker. Completely remove ALL ads. No "acceptable" ads or whitelisted advertisers, block tracking, block malware!

Rated 5 out of 5 stars (2,614)
441,261 users

Amazon Assistant for Firefox Compatible with Firefox 57+

This is an official Amazon extension for Firefox. Amazon Assistant helps you make better shopping decisions by showing product comparisons at thousands of retail sites. By installing you agree to the Conditions of Use at amazon.com/gp/BIT/TOU.

Rated 4 out of 5 stars (387)
438,414 users

Privacy Badger Compatible with Firefox 57+

Protects your privacy by blocking spying ads and invisible trackers.

Rated 4 out of 5 stars (201)
421,704 users

Awesome Screenshot Plus - Capture, Annotate & More Compatible with Firefox 57+

Capture the whole page or any portion, annotate it with rectangles, circles, arrows, lines and text, blur sensitive info, one-click upload to share. And more!

Rated 4 out of 5 stars (1,650)
404,338 users

Stylish Requires Restart

Restyle the web with Stylish, a user styles manager. Stylish lets you easily install themes and skins for Google, Facebook, YouTube, Tumblr, and many, many other sites. You can even customize Firefox and other programs themselves.

Rated 4 out of 5 stars (908)
384,797 users

HTTPS Everywhere

Encrypt the web! HTTPS Everywhere is a Firefox extension to protect your communications by enabling HTTPS encryption automatically on sites that are known to support it, even when you type URLs or follow links that omit the https: prefix.

Rated 4 out of 5 stars (252)
377,501 users

YouTube High Definition Compatible with Firefox 57+

YouTube High Definition is a powerful tool that will let you automatically play all YouTube videos in HD (High Definition), turn off annotations, change video player size, auto stop videos, auto mute videos, control embedded videos and much more.

Rated 5 out of 5 stars (306)
348,680 users

Web of Trust, MyWOT/WOT: Website Reputation Rating Compatible with Firefox 57+

Instantly know which websites to trust! WOT protects you while you browse, warning you against dangerous sites that host malware, phishing, and more.

Rated 4 out of 5 stars (1,366)
310,125 users

iCloud Bookmarks Compatible with Firefox 57+

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.

Rated 2 out of 5 stars (278)
291,138 users

AdBlocker for YouTube™ Compatible with Firefox 57+

Removes all annoying Ads from YouTube

Rated 4 out of 5 stars (97)
286,181 users

EPUBReader Compatible with Firefox 57+

With EPUBReader you can read ePub files just in Firefox. No additional software needed!

Rated 4 out of 5 stars (218)
265,629 users

Adguard AdBlocker Compatible with Firefox 57+

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

Rated 5 out of 5 stars (435)
260,236 users