Well... not really, we are still having the MetroFirefox app id.

This ID is used to filter incoming reports, and we are only accepting reports that match this app id.
Without this change any Metro testrun fails to send the report with the following error:
`Sending results to 'http://mozmill-crowd.blargon7.com/db/' failed (This document requires the Firefox Application ID).`

We've recently (early December) added support for the Metro App ID in Mozmill:
https://github.com/mozilla/mozmill/blob/88e8bd691bd70bec4bc752af9ebb61dfaac2f50a/mozmill/mozmill/extension/resource/stdlib/utils.js#L21-L24