Close down Firefox completely: At the top of the Firefox window, select the File menu, and select the Exit menu item. Close down Firefox completely: On the menu bar, click the Firefox menu, and select the Quit Firefox menu item. Close down Firefox completely: At the top of the Firefox window, click the File menu, and select the Quit menu item.
In Windows, click Start, open the All Programs list and navigate to the Mozilla Firefox folder. In the Mozilla Firefox folder, select Mozilla Firefox. Hold down the option key, as you start Firefox. Go to your Terminal and run:
You may need to specify the Firefox installation path. Firefox should start up with a Firefox Safe Mode dialog.
Check mark Reset toolbars and controls.
Click Make Changes and Restart to restart Firefox
The default toolbar buttons should now appear in their default locations.