Ideas on supporting native interfaces in Mobile Firefox

I'd like to share my ideas on native interface support in Mobile Firefox.
These ideas are based on Christian's Mobile Goal.
http://www.christiansejersen.com/blog/2007/11/20/mobile-goals/

Goal
Provide mobile web application environment which can use native interfaces.
- It can make XUL add-ons & web applications use native interfaces
through JavaScript

Types of Native Interfaces
(Most of mobile platforms support APIs for easy of use for camera, GPS, contact, and etc..)

There are two types of native interface:
* native interfaces from hardware
- GPS
- Camera
- Phone Call

* native interfaces from application engine
(HTML5)