Being secure, on the web specially is something we all need. There are thousands of risks roaming and getting evolved in shape of different malwares, viruses, file & more. Since these things come via your browser and majority of us use firefox, here are some of the best and useful plugins/add-ons which can help you be safe on the internet.

http://www.smashingdownloads.com/2009/07/13/12-useful-firefox-plugins-for-safe-browsing/