Examine source code of Vehicle Inspector

{
  "manifest_version": 2,
  "name": "Vehicle Inspector",
  "author": "Wenchuan Xia",
  "version": "1.3",
  "description": "Help ADAS developers to identify vehicle efficiently.",
  "permissions": [
    "<all_urls>",
    "notifications",
    "webRequest"
  ],
  "icons": {
    "48": "icons/car.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "all_frames": true,
      "js": [
        "vehinfo.js"
      ]
    }
  ]
}