Parakey

The Firefox Kid: "Parakey is “a Web operating system that can do everything an OS can do.” Translation: it makes it really easy to store your stuff and share it with the world. Most or all of Parakey will be open source, under a license similar to Firefox’s. There are differences between the two projects, however. Although Ross plans to incorporate the talents and passions of the free-software community, he’s building Parakey around a for-profit business model. And he’s leading the charge with a simple battle cry: “One interface, not two!”"

That's whats next from Firefox.