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Firefox not supporting newer video formats (all websites not just youtube)

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Help! I cannot watch videos on client websites or streaming TV/movie sites and youtube that are using the newer formats. I use XP and cannot tell if this is limited to just html5 but is is becoming a bigger issue because it occurs on all types of websites, not just youtube or streaming sites like viki and dramafever. Short of moving to a different browser how can I play/watch html5 and other newer video formats?