Examine source code of autoactueel

{
  "manifest_version": 2,
  "name": "Autoactueel",
  "version": "1.7.9resigned1",
  "description": "Real time Nederlandse rijklaarprijs berekenen van auto’s uit Duitsland - 1.7.8",
  "icons": {
    "48": "icons/autoactueel.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.autoscout24.de/*",
        "*://*.autoscout24.be/*",
        "*://*.autoscout24.at/*",
        "*://*.autoscout24.nl/*",
        "*://*.mobile.de/*",
        "*://*.autoactueel.nl/*",
        "https://www.mercedes-benz.net/*",
        "*://*.gebrauchtwagen.de/*",
        "*://*.ford.de/*"
      ],
      "js": [
        "autoactueel.js"
      ]
    }
  ],
  "options_ui": {
    "page": "ui/options.html"
  },
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{3c91c29e-fa27-4f75-b2e8-48e035c446e2}"
    }
  }
}