I updated to ff 19.0. now the upper portion of the browser is not visible! this includes the Firefox button on the left, the minimize, maximize and close button on the right and the open tabs. I know they are still there bc the cursor can go slight above visible and if I right click I can get some familiar sources, of course if guess correctly where the cursor is! If it in partial screen, all the normal options are there. I tried restoring to defaults, and finally uninstalled and re-installed it, but same problem. As mentioned above, this is not related to F11 full screen. IE and chrome work fine. I would think i'm not the only one this is happening to! thanks.