I'm really not sure why I'm being downvoted (or even killflagged). The Mozilla Foundation is a US based organisation and has no choice in the matter if the feds come knocking for PRISM signup.
Another disturbing aspect is that TOR itself is funded by the US govt. It is not so much of a contradiction. It is very likely that 3 letter agencies actively use and benefit from TOR backed services. But should the cost benefit balance tilt the other way, the money stream will probably disappear and/or its security compromised.