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by toja92 3992 days 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.
1 comments
hkmix 3992 days 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).
link
nitrogen 3992 days ago
Firefox can also install the free Cisco h.264 codec.
link