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Using the HTML5 video player for serving .ogv files in Firefox and Safari, and .mp4 files in Internet Explorer
![How can I force YouTube to not use HTML5 player because it is not working on the latest version of Firefox and now I can't see any video? - Super User How can I force YouTube to not use HTML5 player because it is not working on the latest version of Firefox and now I can't see any video? - Super User](https://i.stack.imgur.com/5LNSI.png)
How can I force YouTube to not use HTML5 player because it is not working on the latest version of Firefox and now I can't see any video? - Super User
![Mozilla has added a feature to Firefox 46 that will convert old YouTube Flash code to HTML5 Video automatically under certain circumstances : r/linux Mozilla has added a feature to Firefox 46 that will convert old YouTube Flash code to HTML5 Video automatically under certain circumstances : r/linux](https://external-preview.redd.it/Mb21YKu94Uu5lraW2nEczC5Og7NMOi4lxU8jCiLf0Ys.jpg?auto=webp&s=071a2d59192df7a9da0c9bb425f2337eb02ec720)