Yes, mozilla mentioned this in a blog post when someone here on HN pointed that they should move persona out of the U.S. Being a U.S. company they have to follow the U.S. law regardless of their servers' location.
I wonder if US laws would apply to foreign corporations entirely owned by US corporations? E.g., if Amazon set up an Irish corporation to own and manage a data center in Ireland, even though Amazon still exercised control, wouldn't that data center be outside the scope of US law?