Mozilla today unveiled the Jetpack Gallery, a place for developers to showcase their Jetpack add-ons.  Jetpack is a Mozilla Labs project that lets developers build Firefox add-ons using HTML, CSS, and JavaScript. While the newly launched gallery – still in beta - gives developers the opportunity to host and promote their Jetpacks, it lets Firefox users browse, install and rate Jetpacks. Installing Jetpacks is quite easy and doesn’t even require a browser restart, save for the very first Jetpack that a user installs. The Jetpack Gallery currently features over 30 add-ons.