If you have FireFox browser 3.0- 3.6, there's an addon called Flash Game Maximizer.
After installed, there'll be a G at the bottom of the browser window. If you go to a page that has some kind of interactive like a video or a game, the G will turn blue- when you hover over it, it says Flash Game Detected- click to maximize. So, click it and whatever is on the screen will transform into a FULLSCREEN! If there's more than 1 on the page, a little box will pop up, letting you choose which one to maximize.
https://addons.mozilla.org/en-US/firefox/addon/9631