You are probably just running an older verison of Firefox, undoing Fullscreen with F11 is perfectly fine on Firefox 25.0.1.
there is no fullscreen option on the game, but you can play whituot facebook column on Digital Chocolats website, and aqctivate the browsers fullscreen ( F11)
To fullscreen in Dead Frontier, you can typically press the F11 key on your keyboard, which is a common shortcut for toggling fullscreen mode in many games and applications. Alternatively, you can adjust the settings within the game by navigating to the options menu and selecting the fullscreen display option. If you’re playing in a web browser, you might also try using the browser's fullscreen mode by pressing F11 while the game is active.
just press f11 or go to options>display setup>advanced> and change the resolution
Press f11 to make youre screen go into fullscreen, press f11 to take it off full screen
Function key F11 toggles Full-screen mode on and off.
Go to your settings and turn off fullscreen Or press F11
To go fullscreen in Super Smash Flash 2 v0.9, click on the "Options" menu in the game. From there, select "Fullscreen" to toggle the mode on. Alternatively, you can also press the F11 key on your keyboard to quickly switch to fullscreen.
You just press F11 again, and it should go away.
pressing alt + F11 on start up on a PC will initiated whats called a ghost program, that after following the steps it gives you, will reset your PC to the way it was when you took it out of the box.
For the Xbox 360 Edition: You need to hook up an HD cable between your xbox and tv, that's the only way splitscreen works.
Full Screen Mode: the F11 key toggles Full Screen Mode on and off.
Try clicking the ESC key or the F11 key. You may have accidentally gone to full screen view.