Deleted user names and passwords will not apear on a list in the form, but if I start typing them they apear

Deleted user names and passwords will not apear on a list in the form, but if I start typing them they same apear if I deleted the history. I encountered this problem on several computers: a PC with XP, one with Windows 7 and Mac so I know for some there is a firefox problem. Somehow the passwords and user names remain stored even if previously deleted. I want to sell my PC but I can not because of security risks. Of course, the problem could be solved by formatting the HARD drive and reinstall the OS, but I want to know how to solve the problem without doing. I've tried everything and still they stay... Please help me... and I want to know if anyone else has this problem. Thank you!

If the names and passwords still show in the password manager so that they are not deleted.
See http://kb.mozillazine.org/Password_Manager

If you don't see them in the password manager, but they still fill then you either they have saved in form or you have an extension that has saved this data.
See remove the navigation, search and download history on Firefox

You can check the form data saved with this extension:
Form history control: https://addons.mozilla.org/firefox/addon/12021

Tags: Firefox

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