Everything except the web page disappears, which I do not want to happen. I can get the address bar and tabs back by hovering at the top of the page, but they disappear again really quickly and it takes some care to reach the back and forward buttons, or to click on the address bar and type in a new URL, or to click to open a new tab. It is driving me nuts. I haven't reset preferences or anything so I can't imagine why this would happen. There is no menu bar, so I can't find a way to look at and change my preferences. The bar along the bottom, which tells me what else is going on in the computer and the time, is also gone, which is annoying. That doesn't come back when I hover at the bottom of the page. So I have to alt+tab to get around. I only installed Firefox on this machine a couple of weeks ago. I'd be grateful for advice, thanks!