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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Robbo Scratch 3",
  "version": "3.0.0",
  "minimum_chrome_version": "23",
  "icons": {
    "16": "icon_16.png",
    "128": "icon_128.png"
  },
  "app": {
    "background": {
      "scripts": [
        "main.js"
      ]
    }
  },
  "permissions": [
    "serial",
    "unlimitedStorage",
    {
      "fileSystem": [
        "write",
        "retainEntries",
        "directory"
      ]
    },
    "usb",
    {
      "usbDevices": [
        {
          "vendorId": 6421,
          "productId": 30583
        }
      ]
    }
  ]
}