Firefox problem

Hi, can anyone help me with this Firefox problem? This is what my browser currently looks like: Firefox problem

As you can see, all the upper navigation buttons and menus including the address bar are gone.

I don’t know where to click to restore the settings!
Many thanks,
Torsten[YSaerTTEW443543]

TOEIC short conversations: A customer makes an appointment to have his car serviced[YSaerTTEW443543]