Is this about logins stored in the Password Manager (about:logins) or about ticking a box on the website to remember you ? The latter is about keeping a special session ID cookie to authenticate you to the website server. If you lose such a cookie, then you need to authenticate (sign in) again. ----- Detail like websites remembering you and log you in automatically is stored in cookies, so make sure you aren't clearing important cookies. You can use these steps to make a website recognize and remember you. *create a cookie allow exception with the proper protocol (https:// or http://) to make a website remember you You can check that you aren't clearing important cookies. *using "Delete cookies and site data when Firefox is closed" to clear cookies keeps cookies with an allow exception<br>in 102+ version toggling this setting makes changes to the "Clear history when Firefox closes" settings and those settings prevail *using "Clear history when Firefox closes" in Firefox 102+ honors exceptions and keeps cookies with an allow exception, previous versions removed all cookies Make sure to keep the "Site settings". *clearing "Site settings" clears exceptions for cookies, images, pop-up windows, and software installation and exceptions for passwords and other website specific data *Settings -> Privacy & Security<br>Cookies and Site Data: "Manage Exceptions" *Settings -> Privacy & Security<br>Firefox will: "Use custom settings for history":<br>[X] "Clear history when Firefox closes" -> Settings