Accessing the admin port 8090 for locally deployed app?

In the Mendix Service Console a 'Server Admin Port' can be specified (default: 8090). Does this have any use for me? Starting http://localhost:8090 gave me the Windows prompt asking me with which program I wanted to use an application/json file. I chose Firefox, that failed: {"message":"Use content type 'application/json' for requests to this application.","result":-2}