{
  "manifest_version": 2,
  "name": "echo",
  "description": "Echo server.",
  "version": "0.1",
  "app": {
    "background": {
      "scripts": [
        "background.js"
      ]
    }
  },
  "permissions": [],
  "sockets": {
    "tcpServer": {
      "listen": ""
    }
  }
}