we detect the region once and only once per session. [this gets called](https://github.com/spasovski/fireplace/blob/cc51a90d6/hearth/media/js/mobilenetwork.js#L392) when the [module gets first imported](https://github.com/mozilla/fireplace/blob/master/hearth/media/js/marketplace.js#L31). so I'd forget about adding another event.