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Summary:

Download FLV video from YouTube.
You need a FLV player to playback.

You don't actually need it because you can also download YouTube videos from bookmarklet,
but this is my first Jetpack script and I don't have any better ideas :p

Jetpack, a new project by Mozilla Labs, a new way to extend Firefox on tools you already know: jQuery, Firebug, JavaScript and HTML

Userscripts.org is excited to see how Jetpack evolves. If you have ideas on how we can better support Jetpack, join us in our Jetpack forum.