You can use one of these to leave Full Screen mode:press the F11 key.click the Maximize button at the right end of the Tab bar.click the Full Screen button in the "3-bar" Firefox menu button drop-down list.right-click empty space on a toolbar and click " Exit Full Screen Mode"
Note: You can press and hold the Ctrl and Alt keys while pressing the Left, Right, or Down arrow to rotate the screen a different direction. Method 2: Right-click on your computer desktop screen. Click on Screen Resolution in ( Windows 7 and 8/8.1) or Display settings in Windows 10.
To move the taskbar from its default position along the bottom edge of the screen to any of the other three edges of the screen: Click a blank portion of the taskbar. Hold down the primary mouse button, and then drag the mouse pointer to the place on the screen where you want the taskbar.
Use the following hotkey combination to rotate the screen. Press and hold Ctrl+ Alt and press either the left or right Arrow key.