This is a very specific problem to FireFox, and no other software I've tried. My secondary output (on my graphic card) is connected to my tv. When I open my tv, the computer recognize the tv being connected, the main output (my monitor) goes to black while we can hear the "usb connected" sound, and as the monitor comes back up to normal, FireFox isn't isn't maximized anymore. (I use FireFox always maximized) Instead FireFox is now using the full screen, as if I had manually dragged the edges of FireFox window to each sides of the monitor. There isn't much lost of what's being shown in the tabs, but I *always* have to press 'Maximize' to... remaximize FireFox. Why is FireFox switching maximize for fullscreen why Windows recognize my secondary output being connected?