Examine source code of derstandard essentials

{
  "manifest_version": 2,
  "name": "derstandard essentials",
  "version": "0.1.4",
  "content_scripts": [
    {
      "css": [
        "styles.css"
      ],
      "matches": [
        "https://www.derstandard.at/*"
      ]
    }
  ],
  "icons": {
    "128": "img.png"
  }
}