Activity Stream is a new initiative at Mozilla to improve the user’s experience on the newtab page. It is a collection of all the things you do in the browser that you care about displayed in a rich and meaningful way. Activity Stream takes the form of a timeline-like feed in the new tab page. It also displays rich content with images from recent pages, screen shots, downloads, closing sessions, notifications, and improves your frecency (frequency + recency) results in the awesome bar. Eventually we hope to be the central feed of the things you care abou