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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "mBlock",
  "description": "",
  "version": "1.0.3",
  "manifest_version": 2,
  "permissions": [
    "serial",
    "background",
    "usb",
    {
      "usbDevices": [
        {
          "vendorId": 1046,
          "productId": 65535
        }
      ]
    }
  ],
  "app": {
    "background": {
      "scripts": [
        "common.js",
        "index.js"
      ]
    }
  },
  "sockets": {
    "tcp": {
      "connect": [
        "192.168.100.1:8084"
      ]
    },
    "tcpServer": {
      "listen": "192.168.100.1:8084"
    }
  },
  "externally_connectable": {
    "matches": [
      "*://editor.makeblock.com/*",
      "*://education.makeblock.com/*",
      "*://education.test.makeblock.com/*",
      "*://localhost/*",
      "*://45.79.97.129/*",
      "*://119.23.129.206/*"
    ]
  },
  "icons": {
    "16": "calculator-16.png",
    "128": "calculator-128.png"
  }
}