From within Visual Studio you can specify which browser you want launched when running your Silverlight application. Your default system browser is not affected by this setting.

To make this change right click on the web page that has your Silverlight control (such as default.aspx) and choose “Browse with…” from the context menu. This will bring up the following dialog:

From within this dialog select the browser you want to use and click the “Set as Default” button. Note that you can also change the default size of the browser via the drop down combo-box.

Close the dialog when you are good to go.

Thanks,
–Mike