title: mkv issue in firefox
body: <p>I've been searching for this a lot, and I think it is not possible but for being sure:
  I have some MKV video files which I want to put them on my website. The problem is you can't
  play them in firefox and it only works in chrome browser. I'm using html5 player(js player).</p>
  
  <pre><code>&lt;video id="example_video_2" class="video-js vjs-default-skin" controls preload="auto" width="800" height="600" poster="&lt;?php echo $teacher_pic ;?&gt;"  data-setup='{"example_option":true}'&gt;  &lt;source src='&lt;?php echo $video_url;?&gt;' type='video/mp4' /&gt; &lt;/video&gt;
  
  &lt;script&gt;
    videojs.options.flash.swf = "video/video-js/video-js.swf"
  &lt;/script&gt;
  </code></pre>
  
  <p>I also tried "<a href="http://camendesign.com/code/video_for_everybody" rel="nofollow">Video for Everybody</a>" player but it didn't help. 
  So , is it related to player or not ? is it basically possible to play my videos in firefox?</p>