Examine source code of Google Malternativ

{
  "manifest_version": 2,
  "name": "Google Malternativ",
  "short_name": "Malternativ",
  "version": "1.0.1",
  "description": "Diese Erweiterung fügt \"Malternativ\" zu jeder Google-Suchanfrage hinzu.",
  "author": "Abdülhamit Yilmaz",
  "homepage_url": "https://github.com/abduelhamit/Google-Malternativ",
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "64": "icon64.png",
    "96": "icon96.png",
    "128": "icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.google.com/*",
        "https://www.google.de/*"
      ],
      "js": [
        "contentScript.js"
      ],
      "run_at": "document_start"
    }
  ]
}