Quick summary: I want Firefox to remember and autofill usernames, but not save passwords.
Since a lot of web sites use email addresses as usernames and I regularly use a disposable email address service, I have a lot of different usernames on a lot of different web sites, and they are impossible to remember.
I would like Firefox to remember and autofill the username I use on each site, but I don't really want it to remember my passwords. I just really dislike the idea of a computer remembering my passwords for me, plus if I get in the habit of that, I'm more likely to forget them and be unable to log in from anywhere but my accounts, whereas I don't mind a computer remembering my usernames and email addresses.
The default Firefox "Remember search and form history" doesn't meet my criteria because it will present data as suggestions that I've entered on other web sites, and my DEAs are random collections of numbers and letters. I wouldn't have to remember random strings of characters, but I would have to remember which random string is which, and there's only marginal benefit to that.
Does anyone have any suggestions? An extension seems like an appropriate solution, but I'm open to anything faster than what I'm doing now, which is to log into my DEA service and search for the email address.