Bug 1037391 - Origin in manifest is ignored at build time. r=yurenju

I wouldn't change this. At least not this way. If we want to have a installOrigin (which AFAIK is only good for allowing that origin to know which apps are installed) we should have a specific field for that (or just get that from metatada.json also for non pre-packaged files). We should *not* hardcode marketplace.firefox.com here, IMO.