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: *You can create a cookie "Allow" exception to keep specific cookies, especially in case of secure websites and when cookies expire when Firefox is closed. *Tools > Options > 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 *Tools > Options > 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 exceptions for cookies, images, pop-up windows, and software installation and exception for password and other website specific data *clearing cookies will remove all selected cookies including cookies with an "Allow" exception you may want to keep