Browser Select is a utility to dynamically select the browser you want instead of just having one default for all links. similar to the prompt in android to choose a browser when a link in a non-browser app is clicked/touched.
Sometimes you might want to open a link in a browser of your choice, instead of the default one. Hurl is used to let you choose the browser everytime you click a link (links outside of browser). So naturally, It acts as default browser to do that.