Hi, point to the top of the screen, right click > Exit Full Screen Mode.

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dougholdco said

I accepted several updates suggested by Kaspersky Software Updater, but now have Firefox full screen at launch, no URL displayed, no bookmarks bar, etc. None of the thing normally displayed at the top of the screen are there. However, moving my cursor all the way to the top of the screen does give me an address bar, search window, and all the icons to the right such as the star, show bookmarks, save to pocket, etc. Moving my cursor down the screen makes them disappear again.

Thanks! Although this did the trick, I originally couldn't even get a URL bar by putting my cursor at the top of the screen. Above it there were no tabs displayed, and above that, no File/Edit/View etc., which is the same line the buttons are for full screen mode and closing Firefox. I had to ctrl/alt/delete to exit Firefox from my Task Manager. Things slowly started to appear, as if by magic. Weird, huh?