Hey there@cpeterson,Thanks for taking a look at this. The best implementation of the full screen mode I've seen is with Samsung browser on Android.The way it works is:Scrolling hides the system toolbar along with the address bar, exactly like you sai...
Noticed that on beta the bottom bar now hides, but the status bar is still visible. For a better reference, samsung browser does this well. This is currently the only thing preventing me from fully moving to FF for reading.