Examine source code of Neighbor Detective

{
  "manifest_version": 3,
  "name": "Neighbor Detective",
  "version": "0.1.0",
  "description": "See neighborhood livability scores while browsing Funda.nl",
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "https://pqdvektzvcliuhlwbjni.supabase.co/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "neighbor-detective@dev",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "background": {
    "scripts": [
      "background/service-worker.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.funda.nl/*",
        "https://funda.nl/*"
      ],
      "js": [
        "content/detector.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  }
}