Do you mean tabs you left open that you were browsing in, or the buttons that used to appear below the address bar? Below the address bar, Firefox can display your Bookmarks Toolbar. To turn different bars on and off, you can use one of these methods to show the toolbar list and select the desired bars there: * right-click (or on Mac Ctrl+click) a blank spot on the tab bar (or the "+" button) * (menu bar) View > Toolbars * in Customize mode > Show/Hide Toolbars (see: [[Customize Firefox controls, buttons and toolbars]]) To turn on the Bookmarks Toolbar, or other bars, click it on the list. Success?