From one day to the next when shutting down my computer to turning it on the next day, the bookmark toolbar, browser address window (& its attendant drop-down history links), Search window, Back Bar (the little arrow you click on to go back one link at a time), etc., all disappeared. At the top of my Firefox Browser is nothing but a gray line where tabs show up. I can, of course, go up to the Firefox Menu Bar at the top of my computer screen and click on File--New Window, but that takes extra time and is quite inconvenient (now that I am accustomed to have convenience of one click searching).