At Google DevFest in Amsterdam, I heard from Frank van Puffelin who introduced Firebase to us that at that time (10/10/2015) they had a data center in the USA and planned to open it in Europe.
I would like to give you more details, but all that I know.
I also hope that they will open a data center in the EU, as there are recent laws on where our data is stored from EU citizens, and that Safe Harbor legislation will become irrelevant from what I understand (correct me if I'm wrong).
Nadjib
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