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I have problem with play video on some site (example yapfiles.ru or smotri.com). But on youtube I have no any problems. I use Windows XP SP3 32bit Firefox 52.2.1 ESR I need install some plugin or change some setting? Or maybe playback H.264 not work in WinXP?

I have problem with play video on some site (example yapfiles.ru or smotri.com). But on youtube I have no any problems. I use Windows XP SP3 32bit Firefox 52.2.1 ESR I need install some plugin or change some setting? Or maybe playback H.264 not work in WinXP?

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This is a duplicate post please post in the other one.