I know there is already a thread on how the number of concurrent users is calculated in Firebase, but it doesn't answer my question, which is: if a single user has multiple observers to multiple locations in a single Firebase application, does it count as one or several concurrent users?
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Multiple observers to multiple location from the same Firebase connection is counted as one concurrent only. Every web page shares a single connection to a given Firebase, but not across iframes or tabs. Every node.js, iOS or Android process will share one connection per Firebase as well.

Anant
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Thanks for your reply. Do you have any source on this? Their doc didn't seem very clear to me on that point, but maybe I missed something – axelcdv Sep 04 '13 at 13:05
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I work at Firebase :) Feel free to email support@firebase.com if you have any other billing related concerns. – Anant Sep 04 '13 at 18:37