Other Key Features:
Full, Snapped and Fill views: These options let you chose if you want to view an app full-screen, or ‘snapped’ to a narrow region of the screen (typically to the left of the screen like a sidebar), or if you’d like your app to ‘fill’ the remaining screen area not already occupied by an app in ‘snapped’ state.
Visual Navigation: The big tiles on the start screen make browsing a more visually-rich experience and are easy to recognize and tap. The tile-based interface simplifies auto-complete and makes searching quick and easy.
Windows Share integration: Share a Web page or a piece of content from any Web page to any of your installed social networks.
If you’re on Windows 8, visit the Windows Start screen to locate the Firefox tile. On Windows 8.1, visit the All Apps Screen, locate the tile there and pin it to your start screen.