The FireBox project aims to develop a system architecture for third-generation Warehouse-Scale Computers (WSCs). Firebox scales up to a ~1 MegaWatt WSC containing up to 10,000 compute nodes and up to an Exabyte (2^60 Bytes) of non-volatile memory connected via a low-latency, high-bandwidth optical switch. The FireBox project will produce custom datacenter SoCs, distributed simulation tools for warehouse-scale machines, and systems software for FireBox-style disaggregated datacenters.