Jetpack is an API from Mozilla labs that allows anyone who can code for the web (HTML, CSS and Javascript) to write their own Firefox addons. For creating Firefox addons you need to know Javascript, XUL and XMl, but with Jetpack you could create Firefox addons with ease.
Specifically, Jetpack will be an exploration in using Web technologies to enhance the browser (e.g. HTML, CSS and Javascript), with the goal of allowing anyone who can build a Web site to participate in making the Web a better place to work, communicate and play.
Jetpack is an early release of the project and is available under open source. Mozilla says this is an unpolished, unfinished, and still highly prototyped release.
This version 0.1 release APIs support writing status bars, tabs, content-scripts, animations and more. Support for external API libraries like Twitter is enabled. Supports jQuery. Inline debugging with Firebug.
