How can i use my full screen when in horizontal orientation? I should have been more explicit, sorry. When I am browsing a site and turn my Samsung Galaxy J7 Prime to landscape the window does expand horizontally but most of the screen is occupied with Firefox header and footer. How do I then tell it to not show that info? I looked in the command bar settings but don't see an option to Zoom or Full Screen. On my desktop I use the F11 key. Thanks for your help.