Examine source code of EstateMetrics

{
  "manifest_version": 2,
  "name": "EstateMetrics",
  "version": "2.6.1",
  "description": "A browser extension to evaluate real estate.",
  "browser_specific_settings": {
    "gecko": {
      "id": "{722ca096-6d56-4b06-99e0-caacc3d08cc6}",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "websiteContent"
        ],
        "optional": []
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "icons": {
    "48": "icon/main_logo_48.png",
    "96": "icon/main_logo_96.png"
  },
  "permissions": [
    "tabs",
    "https://firestore.googleapis.com/*",
    "https://*.googleapis.com/*",
    "https://*.firebaseio.com/*",
    "https://data-api.ecb.europa.eu/*",
    "https://nominatim.openstreetmap.org/*",
    "storage"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'; connect-src 'self' https://*.googleapis.com https://*.firebaseio.com https://data-api.ecb.europa.eu https://nominatim.openstreetmap.org; img-src 'self'",
  "content_scripts": [
    {
      "matches": [
        "*://*.immobilienscout24.de/*"
      ],
      "js": [
        "content.bundle.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.bundle.js"
    ]
  },
  "web_accessible_resources": [
    "icon/main_logo_48.png",
    "fonts/*.woff2"
  ]
}