I usually run with FF's anti-phishing turned off as I rely on other security.
To check if it is working for you click the link below.Don't worry, it's a test page from Mozilla.
Quote:
OK, not really, but web forgeries (also known as phishing pages) are out there on the Internet, and you should always use caution before giving your personal information to a web page. Firefox 2 provides built-in Phishing Protection to help you identify web forgeries. If you're using Firefox 2, you should have been warned away from this page.