Such a detail like is likey 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. *Options/Preferences -> Privacy -> "Use custom settings for history" -> Cookies: Exceptions Remove the cookies from a website to make the website forget about you. Clear the cache and remove the cookies from websites that cause problems via the "3-bar" Firefox menu button (Options/Preferences). "Clear the cache": *Firefox/Options/Preferences -> Advanced -> Network -> Cached Web Content: "Clear Now" "Remove the cookies" from websites that cause problems. *Firefox/Options/Preferences -> Privacy -> "Use custom settings for history" -> Cookies: "Show Cookies"