Examine source code of Speed Typing Challenge

{
  "manifest_version": 2,
  "name": "Speed Typing Challenge",
  "version": "1.0.0",
  "description": "Thử thách gõ nhanh xuất hiện mỗi khi mở tab mới.",
  "permissions": [
    "storage"
  ],
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "speed-typing-fbbbfa19-0715-4369-82d5-45da66e9b92e@example.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}