Here's a much better explanation and implementation: http://mobile.tutsplus.com/tutorials/mobile-web-apps/remove-address-bar/ .  This seems like a good idea, but I think we need to approach it a bit more delicately.  The code above handles a lot more edge cases, and we should probably only trigger it if we detect a viewport less than a certain size.  For now let's replace this block with a comment and the link above and we'll figure it out in a different PR.