You Tube videos and html5
You Tube says I can't play the last video of my online art class because my browser (Firefox) will not support it due to html5 issues. I was able to play the other videos without a problem. How can this be fixed?
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Firefox does not support some video types which use non-free video codecs (MSE & WebM VP9). Unfortunately Google has disabled falling back to flash video when it detects users are using Firefox.
If you have Flash installed you can switch to Flash video on YouTube using an add-on like https://addons.mozilla.org/en-US/firefox/addon/youtube-flash-video-player/
This should let you play the video in Firefox.
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