What Sorcery is this!? Rated 5 out of 5 stars
I'm not sure how this addon works, most HTML5 YouTube video addons just add "&html5=1" to the end of the URL and do not work on other sites, and cannot display older videos on YouTube if they don't support the "YouTube HTML5 Video Player"
But this... works almost everywhere, and IIRC on every YouTube video! Sure there's some odd lag/freeze on the browser on occasion if I try to move the video forward, but its well worth not having to have flash installed!