When you are on a login page and Pass offer you to fill username/password, if you have different usernames, you have the list.
The display of this list is : in big the name of the website and in very small (at least for me) the username associated in the list. It will be more easier to have the username in big letters and name of the website in small (or even discard it, I know on which website I am).
You need to think to older peoplle who have not good eyes anymore :)