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sɛur AbysmalTech di July 6, 2009 ·

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/

This review is for a previous version of the add-on (0.2.1).