I have to say that the drop down window which appears at the top of the browser when you go to a web-page with a form is extremely ugly - huge fonts, no finesse to it - and talks about 'Which login would you like to use' even if there is only one login - no 'IGNORE' / 'CLOSE VAULT ' / 'DO NOT FILL IN' options etc.
Even worse, in Firefox v23 it can show up for a split second and then disappear - having completed some of the fields.
Whilst Norton Vault is very good for remembering your login information and meaning that you do not have to remember numerous login details it is fatally flawed for the following reasons:
a) It completes pretty much any forms whether they are a login page or not - text input fields such as 'title' can be over-written with stored username data for that site!
b) It overwrites fields which are pre-filled - sometimes when you first go to the web page, or even worse, when you submit the form!
c) phpmyadmin is dangerous to use under it - as it overwrites fields (such as a numeric id field) (!)
d) even if (under the previous Norton 360 version), you told it 'never on this page' - it ignored that and could still pre-fill information or over-write it!
All of this was reported by me as issues in Norton 360 (2013) - unfortunately nothing appears to have changed in the latest version to address these issues.