Getting the “Sign In as different user”-option back in SP2013

Here is a great and easy to follow post on how to get your “sign in as different user” option back into the welcome control in SharePoint 2013. I can understand, why Microsoft removed it, but in reality of life it’s really still necessary for administrators. Especially if you are troubleshooting. I’ve been working with SP2013 for the last 6 months now and I am seriously missing this option. Everything else is not as easy nor fast.