Extensions by Weekly Downloads

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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 (4,945)
632,155 weekly downloads

uBlock Origin Featured

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

Rated 5 out of 5 stars (1,219)
434,041 weekly downloads

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 (1,445)
86,091 weekly downloads

Cisco WebEx Extension

Join WebEx meetings using Firefox ™

Rated 3 out of 5 stars (38)
83,420 weekly downloads

Bulk Media Downloader

Grab and download media (image, audio, and video) resources by monitoring network (like FlashGot or Flash video downloader extensions)

Rated 4 out of 5 stars (47)
73,300 weekly downloads

LastPass Password Manager Requires Restart 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 (1,516)
68,388 weekly downloads

Awesome Screenshot Plus - Capture, Annotate & More

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 (1,407)
64,403 weekly downloads

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 (1,706)
55,050 weekly downloads

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 (1,321)
38,473 weekly downloads

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 (150)
31,476 weekly downloads

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 (293)
24,952 weekly downloads

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 (797)
21,480 weekly downloads

AdBlocker for YouTube™

AdBlocker for YouTube™ removes all annoying Ads from YouTube

Rated 4 out of 5 stars (52)
17,161 weekly downloads

Youtube Downloader 4K - Video Downloader Requires Restart

Download from YouTube 4K videos and thousands other video websites.

Rated 4 out of 5 stars (279)
15,498 weekly downloads

Disconnect

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

Rated 4 out of 5 stars (223)
13,973 weekly downloads

Privacy Badger

Protects your privacy by blocking spying ads and invisible trackers.

Rated 4 out of 5 stars (132)
12,147 weekly downloads

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 (523)
11,853 weekly downloads

Simple YouTube to MP3/MP4 Converter and Downloader

Download youtube videos as mp3/mp4/ogg/webm fast and easy! Adding mirrors everyday to decrease any downtime! We monitor comments and work to fix any problems as soon as possible!

Rated 4 out of 5 stars (129)
11,834 weekly downloads

Instagram

Instagram Web Based

Rated 4 out of 5 stars (34)
11,399 weekly downloads

Disable WebRTC

WebRTC leaks your actual IP addresses from behind your VPN, by default.

Rated 5 out of 5 stars (46)
11,256 weekly downloads