Only on some Rated 3 out of 5 stars
only works on some original flash games.. but some don't work either.
And that, unfortunately, is as good as it will ever get...
... Since it is quite easy, either intentionally or by accident, for the Flash or web-site developers to prevent their Flash content from being zoomed, no matter how I might try to do it. This is why I made sure to include at least one remark to this effect in the description of my extension.