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It works on Chrome, but somehow it doesn't work on Firefox..

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  • This is on-topic based on "Browsers and their features relating to the use of a web application."
    – jonsca
    Jul 27 '14 at 12:04
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You can play a YouTube video at twice its speed on Chrome because you're using an HTML5 <video> player. It's almost always automatic on Chrome because Chrome seems to support everything the player needs:

enter image description here

HTMLVideoElement, H.264, WebM VP8, Media, Source Extensions, MSE & H.264, MSE & WebM VP9.

FireFox, on the other hand, only supports the first half:

enter image description here

Hence the player is rarely an HTML5 video object.

However, you can turn it on manually. Go to http://www.youtube.com/html5, and click on the blue "Request the HTML5 player" button:

enter image description here

You can later click "Use default player" if you have any problems. However, you should now be able to change the speed of most of your videos like in Chrome:

enter image description here

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