I just switched to Firefox and struggled with this exact functionality. The posted site ships a script for curl|sh that creates a new firefox profile with a custom userChrome.css.
There is an official thread here with people discussing how the single-page-as-an-app functionality should work: https://connect.mozilla.org/t5/discussions/how-can-firefox-c...
I ended up writing a firefox extension to open up URLs in a new "popup" window[1]: https://addons.mozilla.org/en-US/firefox/addon/web-app-maker.... I just checked it on Windows (usually using linux) and the popup window type does not allow the maximize button to work. Oh well...
[1]https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/Web...
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