> Firefox OS is the ONLY MOBILE OPERATING SYSTEM where all the source code is open including our built-in apps and services.

Not entirely true, your drivers are still closed source.

> A platform that doesn't limit your freedom. You're free to build and distribute your apps without walled gardens. You don't need to pay to place an app on Firefox Marketplace.

The same is true of Android.

> A platform where HTML5 is a first-class citizen.

I would argue that's a bad thing. I'm overjoyed at all the lovely native mobile APIs and apps out there. Few APIs are as bad as the web ones.