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Serving videos off YouTube allows them to avoid bandwidth costs. P.S.: YouTube uses their HTML5 player wherever possible.

• zanny 13y ago
  I have youtube html5 video on, and it only works on adless videos. This one, for example, doesn't use the html5 player.
  • SEMW 13y ago
    https://addons.mozilla.org/en-US/firefox/addon/youtube-all-html5/ https://addons.mozilla.org/en-US/firefox/addon/youtube-all-h...