User Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:44.0) Gecko/20100101 Firefox/44.0 Build ID: 20160210153822 Steps to reproduce: My firefox is set to delete all browser data on exit. (settings->privacy->clear history when firefox closes). My settings dialog is shown in attached picture. This setting worked for me since at least FF 3.x Actual results: Firefox no longer deletes the form data. After closing all browser sessions, it still does autocomplete my login information (email for login) on websites like slack when I reopen the browser. Expected results: All information should be deleted after I close the browser.