Primary goal of this milestone is to enable Firefox addon to provide custom network protocol implementation. This will not enable add-on to provide full IPFS, Dat, SSB implementations (as that would for example require exposing UDP socket API to add-ons) but it would enable add-on to add associated protocol handler and possibly delegate actual networking to local node via native messaging API or a through a public gateway. Unlike [current support of decentralized network protocols][] this will not redirect request but rather load them under specified URL and have content origin be set to scheme://${hostname}.