I think your issue might be different; Does your browser at least render the page correctly, that is do you see a rectangular object in the top left hand side of the page when you load the lessons. If you do then your problem is related to the plugin itself, otherwise its the issue with the page not rendering properly for firefox browsers.
"Invention is the most important product of man's creative brain. The ultimate purpose is the complete mastery of mind over the material world, the harnessing of human nature to human needs." --- Nikola Tesla
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