Do you mean that password are disappearing from the Password Manager or that have ticked a box on a web page to remember you? A detail like a website remembering you (log you in automatically) is stored in a cookie. You can use these steps to make a website recognize and remember you: *Create a cookie 'allow' exception to keep such cookies, especially in case of secure websites and when cookies expire when Firefox is closed. *Firefox > Preferences > Privacy > "Use custom settings for history" > Cookies: Exceptions In case you use "Clear history when Firefox closes" or otherwise clear history. *do not clear the Cookies *do not clear the Site Preferences *Firefox > Preferences > Privacy > Firefox will: "Use custom settings for history": [X] "Clear history when Firefox closes" > Settings *https://support.mozilla.org/kb/remove-recent-browsing-search-and-download-history *Clearing "Site Preferences" clears all exceptions for cookies, images, pop-up windows, software installation, passwords, and other website specific data. *Clearing Cookies will remove all selected cookies including cookies with an allow exception that you want to keep.

Or do you mean your passwords are gone?