The background loads sometimes, but that's it...
I have it set to full screen - scale mode.
None of the sprites show up.
Develop games in your browser. Powerful, performant & highly capable.
You should read : this tutorial (How to make native phone apps with Construct 2 and PhoneGap) and/or this tutorial (Making an iOS web app with Construct 2) if you aim at iPhones and make sure you followed all the steps as provided.
I've just tested your application, it works for me on FF8.0 on desktop.