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It may simply be me, but in Firefox, I don't have the option to change speeds. *update: It looks like they haven't rolled out the change everywhere. I had to change it to HTML5. It still defaults to flash apparently.

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I believe that the YouTube HTML5 video rollout depends on parts of the Media Source Extensions, which are only available in Firefox starting in beta.

Media Source Extensions in Firefox is cutting-edge stuff; you can follow along in https://bugzilla.mozilla.org/show_bug.cgi?id=778617.

The article states what browsers default to HTML5: "YouTube uses HTML5 <video> by default in Chrome, IE 11, Safari 8 and in beta versions of Firefox."

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