On his blog, Christopher Blizzard writes about using Greasemonkey to turn YouTube's Flash videos into Ogg Theora before playing them. The result is Theoratube. "Anyway, I decided to try and make it so that I could easily play Youtube videos without having to use Flash. (Flash — in many ways — is the weak link in the chain. In this case it’s because I can’t fix/hack it, although I’m happy to not have it because my browser is a lot more reliable.)"

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