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YouTube HTML5 settings

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I would like to know what is the correct YouTube HTML settings. I looked in www.youtube/html5 and it was set for "HTML5 player is currently used when possible". There is also "use the default player" setting which can be enabled. Which is correct? Thanks

I would like to know what is the correct YouTube HTML settings. I looked in www.youtube/html5 and it was set for "HTML5 player is currently used when possible". There is also "use the default player" setting which can be enabled. Which is correct? Thanks

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Both are fine. You can go with either. HTML5 player is Firefox's built-in player. And your default player is most likely Adobe Flash. HTML5 player could be a little slower on older machines. If you notice this, you can always change to "use the default player".

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How do I revert to the default player anyway? Because when I open a video in youtube, firefox automatically plays it with html5 player. Note: I set the flash player to 'ask to activate'