If you go into the Customize mode, does the bar have at least one control on it? Alt+v (opens classic View menu) > Toolbars > Customize ---- Occasionally the file that stores toolbar customizations and some other display-related preferences becomes corrupted. You could try renaming the file so that Firefox returns to its default toolbar settings. Open your current Firefox settings (AKA Firefox profile) folder using Help > Troubleshooting Information > Show Folder Switch back to Firefox and Exit Pause while Firefox finishes its cleanup, then rename '''localstore.rdf''' to something like localstore.old Restart Firefox. Any improvement?