Set Different Browser as the Default Debugging Browser in Visual Studio 2010
Sometimes you want to view your site in different browsers within Visual Studio 2010 while debugging. Here are two ways to do it.
Right click on an .aspx file and click “Browse with…” then select the browser of your choice and click “Set as Default.” You can select more than one browser in the list if you want.
There’s also this really great WoVS Default Browser Switcher Visual Studio extension. To make your life even easier.