so if we really need that origin, we should calculate it differently.
we can retrieve the real origin from the mozApps.

You can use `navigator.mozApps.getSelf()` (see https://developer.mozilla.org/en-US/docs/DOM/Apps.getSelf) to access our App object, and this App object has an `origin` property.

We should do this retrieval at startup, and just get it here. I believe this should be done in a new file (like AppProperties) that would old properties/options specific to the sms app. (but if you have other ideas I'd be happy to discuss them)