SharePoint 2013 Sign as different user

SP2010 environment shows that the actual link for signing in as a different user is /_layouts/closeConnection.aspx?loginasanotheruser=true

SharePoint 2013 removed from the UI

But link still exists you can use.

They remove it because this option uses an unsupported browser feature which is unreliable and causes other issues. It is not supported by IE10, Safari