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Re:Two more Flash 0-days emerge in Hacking Team leak by archgoon on Sunday July 12, 2015 @12:47PM (#9874015)
Facebook's inline video player uses it. On linux, I get a popup saying that I must install Flash.
Re:Two more Flash 0-days emerge in Hacking Team leak by toja92 on Sunday July 12, 2015 @12:52PM (#9874031)
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.

Re:Two more Flash 0-days emerge in Hacking Team leak by hkmix on Sunday July 12, 2015 @01:01PM (#9874063)
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).
Re:Two more Flash 0-days emerge in Hacking Team leak by nitrogen on Sunday July 12, 2015 @01:09PM (#9874100)
Firefox can also install the free Cisco h.264 codec.