Examine source code of Property Previewer

{
  "manifest_version": 2,
  "name": "Property Previewer",
  "description": "Preview key property details instantly on Rightmove, Zoopla, and other major UK property sites — all without opening listings.",
  "version": "1.2.18",
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "options_page": "dashboard.html",
  "permissions": [
    "storage",
    "identity",
    "alarms",
    "*://*.rightmove.co.uk/*",
    "*://*.zoocdn.com/*",
    "*://*.onthemarket.com/*"
  ],
  "web_accessible_resources": [
    "dashboard.html",
    "content-scripts/content.css"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Property Previewer",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.onthemarket.com/*",
        "*://*.openrent.co.uk/*",
        "*://*.primelocation.com/*",
        "*://*.propertynews.com/*",
        "*://*.propertypal.com/*",
        "*://*.rightmove.co.uk/*",
        "*://*.zoopla.co.uk/*"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{1f87132d-c3da-4076-b470-478797ab77fb}"
    }
  }
}