Client Context enables you to collect/retrieve data about the current context, but it's not meant for changing the context. Also, the collection/retrieval of data is meant to be done on the client only (i.e. using javascript). Client Context is not meant to be used for sending context data to the server.
Double-click on the icon representing the browser platform. The selector will open, use the arrows to navigate and see the platforms/browsers available:
Click on the platform browser you want to load. When the details have loaded click outside the selector to close.
Client Context enables you to collect/retrieve data about the current context, but it's not meant for changing the context. Also, the collection/retrieval of data is meant to be done on the client only (i.e. using javascript). Client Context is not meant to be used for sending context data to the server.