third-party cookies

Do you have the Targeted Advertising Cookie Opt-Out (TACO) extension? That one will automatically add permanent, generic, non personally identifiable cookies to the browser. Even if you delete one the add-on will replace it.

my password keeps loged on after I loged out how can I make it disappear?

chekes7, you should start a new thread for your question - https://support.mozilla.com/en-US/questions/new