When installing a hosted app we are passing through the feature_profile, for example: http://memory.insertafter.com/manifest.webapp?feature_profile=8a35d06e.32.1 http://cl.ly/image/3W3e1m2P0Y2d That should only be packaged apps.
We do this intentionally for a two reasons: 1. Once v2 of buchets land, hosted app developers wouldn't have any way to get stats on devices that have their app installed. Having the FP in the manifest URL allows these developers to get these stats, though they have to aggregate them themselves. 2. The mozApps API doesn't easily differentiate hosted apps from packaged apps, meaning we'd have to switch between adding and stripping the feature profile from manifest/minifest URLs arbitrarily. This is only going to cause bugs in our buttons code.