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I much prefer to have the option exposed in the UI, but you can do this with any HTML5 video element by setting the video element's playbackRate. Often, it's as easy as 'document.getElementsByTagName('video')[0].playbackRate = 1.5'. I have a bookmarklet that does exactly this, so I love to see HTML5 video being the default more and more.

You should use this add-on, called YouTube All HTML5. It just works.

https://addons.mozilla.org/en-US/firefox/addon/youtube-all-h...

There are a bunch of extensions that could have forced all video to html5 for you.

ClickToPlugin is great IMO and it's kept me from switching away from safari for the longest time.