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/htmlrunner