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When I try to play some videos [HTML 5] FireFox (55.0.2 64bit) under Ubunto Mate fails

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Fred
Fred
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This seems to be Linix or Ubuntu specific, since the same videos play under Windows 7. Here is one for example: https://www.youtube.com/watch?time_continue=24&v=IhAIzc1MgVc There are others.

When I try to play some videos FireFox (55.0.2 64bit) errors out with the below message: See attached file.

I have all the latest updates to Shock, Flash, etc.

If I try a Oracle VM and Windows 7 it still can not play the files If I go to a Windows machine it plays fine.

I'm running Ubuntu Mate 16.04 on a Lenovo G780 with all the latest updates. Another user has similar issues.

Thanks, Fred

This seems to be Linix or Ubuntu specific, since the same videos play under Windows 7. Here is one for example: https://www.youtube.com/watch?time_continue=24&v=IhAIzc1MgVc There are others. When I try to play some videos FireFox (55.0.2 64bit) errors out with the below message: See attached file. I have all the latest updates to Shock, Flash, etc. If I try a Oracle VM and Windows 7 it still can not play the files If I go to a Windows machine it plays fine. I'm running Ubuntu Mate 16.04 on a Lenovo G780 with all the latest updates. Another user has similar issues. Thanks, Fred
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cor-el
cor-el
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Current Firefox versions use the HTML5 media player. This video uses for me VP9/Opus if I check the stats via the right-click context menu.

You can open the YouTube test page to check support in Firefox for playing HTML5 media.