Must have Add-ons for firefox for privacy and security

HTTPS Everywhere is a Firefox extension that encrypts your communications with many major websites, making your browsing more secure.

Ghostery Protect your privacy. See who's tracking your web browsing and block them with Ghostery.

Noscript Allow active content to run only from sites you trust, and protect yourself against XSS and Clickjacking attacks.

Privacy and Security links

The Cryptoparty Handbook is a useful beginner guide to online safety and anonymity. Everone using the internet should read this to protect themselves from online threats and snooping.

Tor Project provides anonymity online by hiding your internet traffic through volunteer relay nodes on the network.