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Well I'm not gonna blame you for it not working in Firefox. I've actually had to re-write client-side code (generally just quick hacks, similar to your project) solely for Firefox patching some sort of quirk or behavior change into their browser. It can get especially annoying if you're always testing with the most recent version.

Nevertheless its a neat app. ;)

I've been told it actually works on the iPhone and plays videos that fail to load due to format problems the normal way. =]

Well it doesn't seem to work on Iron (which is essentially Chrome) on Windows for me.