i forgot how to find the stored passwords for the sites
Does this help?
Type about:preferences#security<enter> in the address box. Look under Logins,
Note: For Firefox v56+ its; about:preferences#privacy Look under Forms & Passwords Or type about:logins<enter> in the address box. +++++++++++++++++++++++++++++++ Turn on Remember Logins. To check the passwords you have listed, press Saved Logins.
Press the Exceptions button and see what's inside.