For my notes,

To enable mixed authentication, follow this: http://blogs.visigo.com/chriscoulson/configuring-forms-based-authentication-in-sharepoint-2013-part-1-creating-the-membership-database/

To manage user which using Form-Based : http://sharepoint2013fba.codeplex.com/

To enable auto sign in for Active Directory (AD) user: https://sharepointobservations.wordpress.com/2015/02/24/sharepoint-2013-configure-automatic-sign-in-with-mixed-authentication/ and http://spautomaticsignin.codeplex.com/