Is anything else missing from your toolbar area? You can check that toolbars are selected for display by using one of these menus: orange Firefox button > Options > (Toolbar Name) ''or''<br> classic View menu > Toolbars > (Toolbar Name) If you can't use the menus, you may be in full screen mode. Try the F11 key to switch between full screen and normal views. If your Navigation toolbar is displayed but messed up, you can try fixing it by customizing it or by resetting it back to its default configuration. This article may help: [[Customize Firefox controls, buttons and toolbars]]. Can you get your back button back?