AllPeers is a browser plug-in that allows users to fairly easily share files with people they know. Users drag file icons onto their friends' usernames in the AllPeers Firefox sidebar, where they can be transferred right away or later.
The software uses the BitTorrent peer-to-peer file transfer protocol, popularized by online music and movie piracy, to carry the data between peers.
AllPeers has always been a Firefox plug-in, but today marks the first time the software has come prebundled with the browser. Mozilla, which maintains Firefox, will not distribute AllPeers, although it does evidently support the move.