i'm totally new to this kind of practices so maybe i'm going to ask a stupid question, mostly because i couldn't find anything googling around.
I'm using Firefox 36 and i modified it so that it saves my passwords without asking me any time and this works.
But I have a problem with the autofill: I would like Firefox to autofill only the email field if it has a stored password, but that it does not autofill also the password field, so that it behaves like it doesn't have the password stored. This is because my computer is being used by other people from my house and i don't want them to access my website when i'm not around, but i also want to have my passwords stored in my browser so that i don't have to look here and there to find them if i forget them (and it happens often :P ).
For now I just managed to totally avoid the autofill (setting to false the variable signon.autofillForms), but i want the email/usernames field suggested to me if i already used them.