Flash Player playback issues in FF 19

I have been using Chrome for a while, but I miss my Lazarus form recovery so now I'm back on the Fox
However there's a bizarre problem that has cropped up after I've re-installed the MacOS
FF 19.0.2 has significant issues with flash player, video framerate is < .5 FPS, the frame will change every time I click the mouse... otherwise the audio will play but the video will not play normally.
If I refresh the page, the video will play properly, but if I pause it, the video will go back to it's incredibly choppy frame rate. This happens with any flash based video, not just youtube.
I've updated my Flash too, but it's only in FF, Chrome doesn't have this problem.
Any thoughts?

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