Make sure that you do not run Firefox in full screen mode (press F11 or Fn + F11 to toggle; Mac: command+Shift+F). *https://support.mozilla.org/kb/how-to-use-full-screen Make sure that toolbars like the "Navigation Toolbar" and the "Bookmarks Toolbar" are visible: *Firefox > Options *"View > Toolbars" Open the Customize window to set which toolbar items to display: *View > Toolbars > Customize *Firefox > Options > Toolbar Layout *Check that the "Bookmarks Toolbar items" is on the Bookmarks Toolbar *If the "Bookmarks Toolbar items" is not on the Bookmarks Toolbar then drag it back from the toolbar palette in the customize window to the Bookmarks Toolbar *If missing items are in the toolbar palette then drag them back from the Customize window on the toolbar *If you do not see an item on a toolbar and in the toolbar palette then click the "Restore Default Set" button to restore the default toolbar set up *https://support.mozilla.org/kb/How+to+customize+the+toolbar *https://support.mozilla.org/kb/Back+and+forward+or+other+toolbar+items+are+missing