Google Search Fixer
Override the user-agent string presented to Google Search pages to receive the search experience shown to Chrome.
7,521 users
uBlock Origin
Finally, an efficient blocker. Easy on CPU and memory.
4,676,212 users
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).
11,015,985 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.
481,146 users
Facebook Container
Prevent Facebook from tracking you around the web. The Facebook Container extension for Firefox helps you take control and isolate your web activity from Facebook.
303,729 users
Privacy Possum
Privacy Possum monkey wrenches common commercial tracking methods by reducing and falsifying the data gathered by tracking companies.
97,638 users
Privacy Badger
Automatically learns to block invisible trackers.
545,520 users
Cookie AutoDelete
Control your cookies! This WebExtension is inspired by Self Destructing Cookies. When a tab closes, any cookies not being used are automatically deleted. Whitelist the ones you trust while deleting the rest. Support for Container Tabs.
137,989 users
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).
11,015,985 users
uBlock Origin
Finally, an efficient blocker. Easy on CPU and memory.
4,676,212 users
Cisco Webex Extension
Join Webex meetings using Firefox ™
1,710,373 users
NoScript Security Suite
The best security you can get in a web browser! Allow active content to run only from sites you trust, and protect yourself against XSS and Clickjacking attacks, "Spectre", "Meltdown" and other JavaScript exploits. Fx52? https://noscript.net/getit
1,403,294 users
Porn/Malware Blocker
Blocks known pornographic and malware domains. When attempting to go to such a domain, the user is redirected to another page, alerting them that the site has been blocked. Unlike other extensions, no content from the blocked site is ever shown.
7,366 users
Block Site
A customizable password protected website blocker and redirector
4,827 users
Parental Control: Family Friendly Filter
Family Friendly browser protection add-on is a content filter to block sites containing pornography and any other kind of inappropriate material.
6,125 users
FoxFilter
Recently called "THE Parental Control for Firefox"! FoxFilter is a personal content filter that helps block pornographic and other inappropriate content. All filtering features are free! Premium features available with small support fee.
14,655 users