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Re:HTML5 Flash Player (Shumway) lands in Mozilla by biot on Wednesday October 02, 2013 @06:15AM (#6481588)
From the fine article:

  "Shumway is an HTML5 technology experiment that explores
   building a faithful and efficient renderer for the SWF file
   format without native code assistance."
By your criteria, you should be fine with this.
Re:HTML5 Flash Player (Shumway) lands in Mozilla by spongle on Wednesday October 02, 2013 @07:07AM (#6481740)
Well if it wasn't for the numer of turtles in the pile on the way down it'd be fine. This is a whole other layer on top...