Mozilla Firefox defaults are generally adequate for Medaille systems. If you need to change them, most settings are on the "Options" menu. On Windows Firefox without the menu bar displayed start with the orange "Firefox" at the upper left, then Options→Options. On a Mac, go to the Firefox menu and choose Preferences).
Under "Privacy": Either choose "Firefox will remember history" or if you prefer then "Use custom settings for history". In that case, "Accept cookies from sites" should be checked (including 3rd party cookies