Sky Go should work with Firefox, it will not work with Chrome which does not support Silverlight. Have a look here-
http://helpforum.sky.com/t5/Sky-Go/quot-An-Error-Has-Occured-The-Application-Must-Now-Terminate/m-p/2373041#M27882
http://helpforum.sky.com/t5/Sky-Go/quot-An-Error-Has-Occured-The-Application-Must-Now-Terminate/m-p/2373041#M27882