But the real answer is that it can't be done anymore with modern browsers -- which is a good thing. I know that Chrome and/or Firefox both allow you to override javascript which tries to hide the address bar and other elements. I personally hate when websites used to do that and I would be more inclined to navigate away from the page and/or block the site if it did. In addition, doing a window.open like that could be interpreted as a popup by some browsers which will trigger a popup blocker and the window would not open at all (unless the user instructed it to do so).
If you want full screen you can ASK the user to go into full screen mode (such as by pressing F11), or you can deploy the application to computers which you totally control and turn into kiosks that run the browser in full screen moe.