Chris Messina posted concept mocks for Firefox on Flickr. The three innovations all focus on evolving the browser to a platform:

  1. Integration of identity into the browser – there’s a new account manager for password management. I have long been waiting for this to happen Expect Facebook to replicate this with either the creation or acquisition of a browser. 
  2. Application management in the browser: the icons in the top of the screenshot replace tabs to make “application switching” more natural and similar to the operating system
  3. Integrated social features: easy following of users by landing on their home page across social networks and seamless RSS subscriptions are exciting