The fact it has no borders in "full screen mode" is really disorientating. I like the concept but wouldn't use it because of the loss of visual feedback (but full screen mode is optional which is fine).

As an aside: It is a shame this "breaks" Chrome's ability to let you re-scale the non-full-screen box. So it is an all or nothing choice, you have to give up something to get something...

It looks like you disabled Chrome's resizing on purpose too, which seems unnecessary/annoying. Why break existing functionality just to add new functionality?