Be careful: I just installed it and it decided it will be my default browser and take over the file associations (.htm, .html, .xhtml) and protocol associations from Firefox. I thought we left this kind of crappy warfare in the late 90s.
In the first screen you have to click on "Options" to change this. I like the streamlined installation process, but the options are indeed very easy to overlook.
The after-the-fact way is to use the Windows defaults tool, a Good Thing to emerge from the defaults wars.