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Facebook's inline video player uses it. On linux, I get a popup saying that I must install Flash.

• toja92 11y ago
  In Safari on OS X, Facebook does use the native <video> player. I'm guessing that Facebook encodes video h264 which isn't natively supported in Firefox; rather it relies on support in the operating system. I'm not sure if Chrome on Linux supports h264, however since Chrome also includes its own Flash player I guess that Facebook may be using their own flash player anyway.
  • hkmix 11y ago
    Pretty sure there are some settings you need to enable in about:config to get H264 working in Firefox (assuming you have the right gstreamer stuff installed).
    • nitrogen 11y ago
      Firefox can also install the free Cisco h.264 codec.