Originally Posted by BofRA
Have you tried FlashResizer or FacebookGamer?
FlashResizer doesn't work on any of the flash games I tried, and I don't play Facebook games for the other.
Originally Posted by rivan
It might not work for all games or combinations of browser/OS/game, but I just set my Firefox Zoom level up and scaled the Flash game up with it.
Obviously not the same control as a 'full screen' scenario, and it zooms the whole page, but might work for the OP.
That doesn't work for this problem at all. It is a very specific issue - Adobe's Flash content without a zoom/full screen option won't zoom by normal means, and there is no Firefox add-on that fixes this.
I think I found a solution. Win7 has a magnifier tool that you can pin to the task bar. I can use it to zoom in on any webpage, and for Flash windows/games it seems like 275% magnification gives me what I want after I line up that screen area.
I also selected "Have Magnifier follow text insertion point" in the option menu to keep the mouse and keyboard from scrolling the page. I can turn off the magnifier when done, and all of these settings are saved for the next session.