1. Lock screen
Here's what you'll see when your phone is sitting next to you in blissful repose. We wonder if you're supposed to slide that central button with the arrows to the right to unlock the phone...because that might land them on the wrong side of Tim Cook's To Sue list.
2. Lock screen notifications
Firefox OS looks to have an extensive set of notifications that you can respond to without having to unlock your phone.
It appears that Firefox has taken a page out of Apple's iOS playbook, as the home screen has lots of floating icons that let you launch apps.
4. Incoming calls
When you get a call from a contact your lock screen will show you the ID and (when applicable) photo of the caller.
5. Dial pad
Of course you don't have to make poor Helena call first, you can always call first with a clean (if fairly standard) dial pad.
6. In-call screen
Again the use of large images and and contact information. As with all other mobile OSes (and traffic lights) green means go and red means stop.
7. Contact page
Add or update your contacts in a layout that's somewhat reminiscent of the contact page from Android 4.x
8. Contacts list
The list of contacts also seems to borrow some design language from Ice Cream Sandwich, albeit with a bit more use of color and font weighting.
9. There's a full-fledged camera app
As you'd expect, there is a simplistic but clear picture-taking app. Even in developing countries (where Firefox OS is thought to be aimed) people expect to be able to snap some pics on their phones.
10. And an image gallery to view them in
This looks very much like the Android ICS image gallery, although there's really only so many ways to make a gallery full of images look without adding needless clutter.
11. A full fledged calendar
You can't make a smartphone without a calendar app. Whether this will implement one of Mozilla's calendar projects, or leverage someone elses product (Google Calendar?) isn't clear.
12. Virtual keyboard and email
Little is known about the email app, although presumably the OS will need to be able to support the many popular webmail options, whose low cost of use (free!) makes them almost ubiqitous.