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

  • 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

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:

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

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

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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:

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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:

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