Flagfox is a Firefox extension that you can use to check out websites to guard against phishing (linking to a fake website instead of the real one when you browse to a website). Version 4.0 has a lot more features than previous ones. https://addons.mozilla.org/en-US/firefox
Search for Flagfox and click Add to Firefox.
Information about the update and about Flagfox:http://flagfox.net/