My Firefox screen has just gone 'full screen' - that is, whatever application I access fills the whole of my laptop screen and is devoid of any toolbars (and no bottom Windows icons) - no obvious way to reduce the screen cover and I have to go to Task Manager (via Ctrl Alt Del) and End Process to escape.
I have re-installed Firefox by downloading 29.0.1 but it returns to full screen without any means of escape other than the aforementioned Task Manager route.
I am currently using IE11 - but that is infected with the (dreaded) QONE8 search engine (even though the Home Page URL is set to Google!).
How do I 'crack' into Firefox to reset a sensible screen size (there's no 'Tools' or icons to click on . . .