I have a feeling this breaks if you set something like google chrome to be your default immersive browser.
Indeed it does break it. (sigh).
Well, for me at least, that isn't a big deal. I leave IE as my default but use chrome for nearly all of my browsing.
Edit: !@#$%, once you break it by changing your default browser, it STAYS broke. So, use this app ONLY if you intend to leave IE as the default browser.