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I tried update newest firefox version but when view website with html5(firefox supported) thats allway error

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My site is gascash.co, i tried added html5 player, open on ie9 thats run ok, but when run on firefox thats error. Im using newest firefox version, do u have any idea to help me please?

My site is gascash.co, i tried added html5 player, open on ie9 thats run ok, but when run on firefox thats error. Im using newest firefox version, do u have any idea to help me please?

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Is it a video that you cannot play? I did not see any videos on that page.