Do you mean that the Back and Forward buttons on the Navigation toolbar are missing? * If, on Windows, in Firefox 3.6 the menu bar is hidden then press and hold the Alt key down or press F10, that should make the "Menu Bar" appear * Go to "View > Toolbars" and check-mark "Menu Bar" with a click on it to make that permanent. See [[Menu bar is missing]]). * Make sure that you have the "Navigation Toolbar" and the "Bookmarks Toolbar" visible: "View > Toolbars" * If items are missing then see if you can find them in the "View > Toolbars > Customize" window * If you see the missing item in the Customize window then drag it back from the Customize window onto one of the toolbars. * If, in "View > Toolbars > Customize", you do not see that item then click the "Restore Default Set" button See also: * http://kb.mozillazine.org/Toolbar_customization