Gaurd your secret informations !
Imagine what can happen if your bank acount or credit card number or password is exposed to some unknown person ! This is usually done through phishing. It comes in various forms-a Facebook Message a fake mail or a log in page of a bank/credit card site.It can even be a Facebook or a Google site. You try to log in and thereby give away your username, password etc. To gaurd against this one must keep the Adress Bar visible. This can help you to know that you are on the right webmail page.