how can i get videos to play in firefox on firestick? /

HI,got Firefox, and get to a video and it won't let me play it or watch it, and just shuts off. So,simply, how enact you move to a video when in a website and have it play? Never have anguish doing it on my computer, and unfamiliar. Anyway,I know it is surely some simple thing needed, Thanks for listening and assisting, and ps

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