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Firefox optionally remembers usernames. I do not let it remember passwords. I mistakenly entered the password in the username field. Now it is remembered and also visible to everyone. How do I delete the usernames?

you can be  in the inputbox and highlight the username in the list you want  and then press  shift delete button that the username might be deleted on firefox (In other words, when you  type first letter in the input  box, the list of username will come out, highlight the one you want  and then press shift delete button)

for deleting password, you can go to options->security->Passwords->saved password
at there you can delete password for sites

Hope understand your question completely, if not , please pt it out
Duncan