Enable 60fps YouTube videos on FireFox

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Step One
Go to http://www.youtube.com/html5 and enable the HTML5 player.

Step 2
Go to about:config Right click > New > Boolean "media.mediasource.ignore_codecs" > Set it to true.

Then make sure media.mediasource.enabled is set to true.

Step 3
If it has worked then all boxes on the YouTube HTML5 page should be ticked.

Step 4
Enjoy 1080p/720p 60fps videos on YouTube.

Keep in mind that this is still experimental and may still have bugs, but I can confirm it does indeed work. Also this seemed to work for me, but as I said its experimental nature means it might not work for everyone.
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