Works fine for me in Chrome using cut/paste URL. Sure you are adding a stream that MySB can play? http and not https? Correct format like mp3?

See if you can add the below URL, it adds and saves fine for me as MySB Favorite.
Not sure it will actually play as it is actually an https but I just removed the s to see if it would save as Favorite

http://transom.org/wp-content/upload...96kbps.mp3?_=5