After installing a new browser you may find that Visual Studio changes the default browser for debugging to the newly installed browser and it is not immediately obvious how to revert back to Internet Explorer or another preferred browser. After a lengthy period of time picking through the settings in the Options dialog box I discovered I was looking in the wrong place. In actual fact you can change it via the File > Browse with menu option where you can also specify the size of the new windows that is launched when you start debugging web apps.