Ever wanted to write your own Firefox extension, but thought the process was too drawn out or difficult to do? Jetpack is looking to use open Web technologies to enhance the browser. The idea here is that if you can make a web page, you will be able to build an add-on for Firefox.
This video does a great job at giving you a basic walk-though of what Jetpack development looks like thus far:
Overall, I am really excited about this! I always love to tweak away at Firefox using tools like Greasemonkey and Stylish (which Jetpack reminds me of, in a sense of being simple ways to extend the browser).
Word of warning, this is an extremely early release of the software, that is still being designed and developed. This version that is out now is pretty much just for the developers and testers who want to start getting their hands dirty.
Grab Jetpack, and play around with it yourself. It might not be for everybody, however should really help to inspire those of us who like to tweak around with our browser to make it work for us.