Mozilla Labs have released a new project called Jetpack. The project is a “newly formed experiment in using open Web technologies to enhance the browser, 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” says Mozilla.
The aim is to allow web developers to design add-ons for Firefox using just HTML, JavaScript and CSS.
A download for Firefox is available along with more information, documentation, and videos from the Jetpack website.