This is all very useful in itself, but the authors have one more trick to further speed up the process. If you visit a site that requires Internet Explorer, then clicking the button will open a new Chrome tab that uses IE's rendering engine to display the page as its designer intended.
Install this Chrome extension and it adds an IE button to your toolbar. There is a more convenient solution, though, and it's called IE Tab.
But if you visit a page that can only be displayed with Internet Explorer then none of this will be of any use at all, and you'll be forced to fire up a copy of IE to view the site properly. There's a lot to like about Google Chrome: a clean and simple design, convenient tab management, and of course its blistering speed.