If you've set your browser to remember form password fields and need to know what the password is (ie. you have forgotten it - but can see the browser rembers it) ... all you need to do is:
- View source and find the id of the password input
- Type the following in the url (replacing the <id> text with the password input's id):
javascript:alert(document.getElementById("<id>").value)
This will pop up an alert with the actual text value in the password input.
NOTE: The simplicity of getting the password text is also a good reminder to NOT have your browser remember your passwords for you ...