Firefox Marketplace app review manager here... At the bottom of every review email, it says you can just reply to the email if you have any questions. And as

Firefox Marketplace app review manager here... At the bottom of every review email, it says you can just reply to the email if you have any questions. And as mentioned elsewhere in this thread, reviewers also hang out in #app-reviewers on irc.mozilla.org. We're really trying to make it as easy as possible to reach a real person!