Examine source code of Google Danergy

{
  "manifest_version": 2,
  "name": "Google Danergy",
  "short_name": "Danergy",
  "version": "1.0.0",
  "description": "Diese Erweiterung fügt \"Danergy\" zu jeder Google-Suchanfrage hinzu! Inspiriert von Malternativ.",
  "author": "Exploitox",
  "homepage_url": "https://youtube.com/danergy",
  "icons": {
    "16": "logo16.png",
    "32": "logo32.png",
    "48": "logo48.png",
    "64": "logo64.png",
    "96": "logo96.png",
    "128": "logo128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.google.com/*",
        "https://www.google.de/*"
      ],
      "js": [
        "contentScript.js"
      ],
      "run_at": "document_start"
    }
  ]
}