Adblock Plus
One of the most popular free ad blockers for Firefox. Block annoying ads on sites like Facebook, YouTube and all other websites. Adblock Plus blocks all annoying ads, and supports websites by not blocking unobtrusive ads by default (configurable).
3,839,848 users
Theme Font & Size Changer
Theme Font & Size Changer lets you change the global font size and font family used for the user interface in Firefox. Design your browser with your favorite font.
7,286 users
LastPass Password Manager
LastPass, an award-winning password manager, saves your passwords and gives you secure access from every computer and mobile device.
550,742 users
FoxyProxy Standard
FoxyProxy is an open-source, advanced proxy management tool that completely replaces Firefox's limited proxying capabilities. No paid accounts are necessary; bring your own proxies or buy from any vendor. The original proxy tool, since 2006.
211,149 users
Stylish - Custom themes for any website
Stylish lets you customize any website with custom user styles (themes for websites). Choose from the largest userstyles library to change the color scheme, background, and skin for Google, Facebook, YouTube and many, many more sites.
36,862 users
Bloody Vikings!
Simplifies the use of temporary e-mail addresses in order to protect your real address from spam. Supports inter alia 10minutemail.com and anonbox.net.
3,885 users
VT4Browsers
Scan your downloads with VirusTotal before storing them, free and easy. More information at: https://docs.virustotal.com/docs/browser-extensions#vt4browsers. Contribute your domain name resolutions to the security community.
5,701 users
ProxTube - Unblock YouTube
In some countries YouTube videos are blocked! Unblock them with this Addon. Supported countries: Germany, Netherlands, Spain, ...? not US compatible Status+Support: proxtube.com & Twitter: twitter.com/ProxTube (EN/DE)
17,162 users
MailHops
MailHops maps the route an email took to get to you. Displaying the senders location, weather, user-agent and authentication used.
5 users
