PercyPea (well known from flashkit – mario kart thread) sent me an email, where he describes a solution to force the browser plugin to hold the FPS very tight.
I tried it for my tileengine games/supermario. It seems to be true and I really would like you to give me your framerate at this example. It should be about 32/33 and actually firefox makes it fine. PercyPea makes also a thread on flashkit, where you can post your comments.
The idea is to adjust 120 FPS and slow down by running a loop untill the necessary milliseconds are passed. Simple as for example java do.