just want to report that i've tried it on two flash games so far and it worked wonderfully. on the second one, the screen was blank the first time i tried it, but i suspect that may have to do with the fact that i use the NoScript extension to block flash most of the time and only enable it manually when i get to a page with flash i want to enable.
also should be said that this worked on multimonitor setup, AND i was able to use my other monitors without it popping out of full screen on the monitor it was on, which is cool, since directx full screen games do not allow this.
and i was able to exit out of the fullscreen game with an escape key without any trouble.
big thumbs up