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 (5,161)
17,240,659 users

uBlock Origin Featured

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

Rated 5 out of 5 stars (1,508)
3,887,453 users

Ghostery Compatible with Firefox 57+ Featured

Increase your browsing privacy, protection, and speed.

Rated 4 out of 5 stars (1,378)
1,250,997 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 (1,839)
878,837 users

LastPass Password Manager Featured

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 (1,733)
743,629 users

Cisco WebEx Extension Compatible with Firefox 57+

Join WebEx meetings using Firefox ™

Rated 3 out of 5 stars (46)
571,108 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 (1,465)
466,673 users

Stylish Requires Restart Featured

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 (818)
417,617 users

AdBlocker Ultimate

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 (1,600)
403,326 users

HTTPS Everywhere Requires Restart

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 (166)
386,319 users

AdBlocker for YouTube™ Compatible with Firefox 57+

AdBlocker for YouTube™ removes all annoying Ads from YouTube

Rated 4 out of 5 stars (61)
311,970 users

Evernote Web Clipper Compatible with Firefox 57+

Use the Evernote Web Clipper to save things you see on the web into your Evernote account.

Rated 2 out of 5 stars (944)
310,173 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 (80)
279,067 users

Adguard AdBlocker

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

Rated 5 out of 5 stars (330)
272,937 users

Easy Youtube Video Downloader Express Compatible with Firefox 57+

"Best Youtube Video Downloader", Only one with 1080p Full-HD and 256kbps MP3 Direct Links. A clean, fast and simple addon for superfast and easy downloads in FLV, 3GP, MP3, MP4, 720p, 1080p qualities on Youtube pages.

Rated 4 out of 5 stars (1,107)
263,154 users

Disconnect Compatible with Firefox 57+

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

Rated 4 out of 5 stars (232)
263,048 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 3 out of 5 stars (138)
241,583 users

ColorZilla Compatible with Firefox 57+

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

Rated 4 out of 5 stars (376)
226,296 users

Self-Destructing Cookies

Fix the web. Gets rid of a site's cookies and LocalStorage as soon as you close its tabs. Protects against trackers and zombie-cookies. Trustworthy services can be whitelisted.

Rated 4 out of 5 stars (553)
204,425 users

Hoxx VPN Proxy

Hoxx VPN Proxy service to unblock blocked websites, hide your location and encrypt your connection. Completely free.

Rated 5 out of 5 stars (2,015)
183,646 users