Autohide for Master Password in Chrome Extension

At times when I enter my password, I might accidentally make one letter upper case and I get the incorrect password error. So I unhide the Master Password and fix it, then press Unlock. But since I made the password visible, during the whole process of verifying the Master Password - it is completely visible to anybody looking at my browser. And during this process I cannot hide it. Could a feature be added such that when I press unlock - if the password is set to visible it should be made hidden before the authentication process starts.