Screencast: https://www.youtube.com/watch?v=IBzrCmGVDkA
Browser.html: an experimental Desktop browser, based on Firefox Desktop and Firefox OS. UI is built in HTML.
Setup
Serve code via a HTTP server:
python -m SimpleHTTPServer 8000
Use a recent B2G build:
b2g --start-manifest http://localhost:8000/manifest.webapp
I recommend to use this branch for now: https://github.com/paulrouget/gecko-dev/compare/b2g-for-browser.html