Examine source code of Realty Scraper

{
  "manifest_version": 2,
  "name": "RealtyScraper",
  "version": "1.0.0",
  "description": "Export Zillow search results to CSV. In-page panel — works on Flatpak Firefox.",
  "browser_specific_settings": {
    "gecko": {
      "id": "realtyscraper@realtyscraper.io",
      "strict_min_version": "115.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": [
          "authenticationInfo",
          "technicalAndInteraction"
        ]
      }
    }
  },
  "permissions": [
    "https://www.zillow.com/*",
    "https://realtyscraper.io/*",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_title": "RealtyScraper panel is on the Zillow page",
    "default_icon": {
      "48": "icon-48.png",
      "128": "icon-128.png"
    }
  },
  "icons": {
    "48": "icon-48.png",
    "96": "icon-96.png",
    "128": "icon-128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.zillow.com/*"
      ],
      "js": [
        "panel-dom.js",
        "vendor/realtyscraper-core.js",
        "content.js"
      ],
      "run_at": "document_end"
    }
  ]
}