Do you mean names and passwords in the Password Manager or do you mean that you are no longer logged on to (remembered by) websites after closing and restarting Firefox? There is a difference between remembering the name and password in the Password Manager and a "remember me" check box on a web page.<br /> The latter usually involves the creation of a special "remember me" cookie that is stored on your computer and that is send to the server.<br /> If that "remember me" cookie is removed or gets corrupted or is not send to the server then the server won't remember you and you need to sign in once again.<br /> ---- Websites remembering you and automatically log you in is stored in a cookie. * Create an allow cookie exception (Tools > Options > Privacy > Cookies: Exceptions) to keep such a cookie, especially for secure websites and if cookies expire when Firefox is closed. Make sure that you do not run Firefox in Private Browsing mode. * https://support.mozilla.com/kb/Private+Browsing * In [[Private Browsing]] mode all cookies are session cookies that expire if that session is ended, so websites won't remember you. * Do not use [[Clear Recent History]] to clear the "Cookies" and the "Site Preferences" Clearing "Site Preferences" clears all exceptions for cookies, images, pop-up windows, software installation, and passwords.

Thank you cor-el that helped. Firefox was set to private browsing mode.