Can I stop Firefox from memorizing UserIDs and account numbers
Firefox memorizes userIDs and I do not see an option to stop it from doing so. Is there an option?
Keep in mind that passwords are not limited to the password entry. Every entry in a sign-in process is an opportunity for a password. For example, the answer to "What street did you grow up on?" could be "Beatlejoice". Similarly, the answer to "What was your mother's middle name?" could be "Aardvark". Nonsensical answers to security questions are more secure than truthful answers.
Again, in the interest of security, is there an option to stop firefox from remembering so much?