A major update just happened with desktop web apps – we have support for Linux operating systems now on Nightly! Our awesome contributor Marco worked hard to deliver support for installing and launching web applications in the chromeless shell seen on other operating systems. See his wiki here to see what he has done so far for linux web apps support and what he plans to do in the future.
Additionally, the Mozilla Marketplace is live and ready for testing! Want to help test the Mozilla Marketplace or desktop web apps on any operating system? Then, go to this wiki to see how you can get started testing the Mozilla Marketplace with the desktop web runtime.