Hello, See this: *[https://support.mozilla.org/en-US/kb/password-manager-remember-delete-change-passwords Password Manager]

Details like websites remembering you (log you in automatically) are stored in a cookie. *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 > Cookies: Exceptions In case you are using "Clear history when Firefox closes": *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/Clear+Recent+History Note that clearing "Site Preferences" clears all exceptions for cookies, images, pop-up windows, software installation, and passwords. Clearing cookies will remove all specified (selected) cookies including cookies with an allow exception that you would like to keep. ---- The Yahoo website is using autocomplete=off to prevent Firefox from saving form data like name and password. You can remove autocomplete=off with a bookmarklet to make Firefox store form data like names and passwords. *http://kb.mozillazine.org/User_name_and_password_not_remembered Note that Firefox won't auto-fill saved form data automatically when autocomplete=off is used, so you need to double-click the empty name field to get a drop-down list.