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készítette: AbysmalTech, júl. 6, 2009 · közvetlen hivatkozás

I'm not sure why Mozilla themselves didn't write a better description, but here is what I got from the project's official page:

"In short, Jetpack is an API for allowing you to write Firefox add-ons using the web technologies you already know."

Source: https://jetpack.mozillalabs.com/