Examine source code of Property checker

{
  "manifest_version": 3,
  "name": "Property checker",
  "description": "Provides short summar of the property on remax.ca",
  "version": "0.1",
  "permissions": [
    "tabs",
    "activeTab",
    "scripting"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "property-checker@dawid.lasz.uk"
    }
  },
  "icons": {
    "48": "images/icon-48.png",
    "128": "images/icon-128.png"
  },
  "action": {
    "default_title": "Click me",
    "default_popup": "popup.html"
  },
  "host_permissions": [
    "https://remax.ca/*"
  ],
  "content_scripts": [
    {
      "js": [
        "scripts/estate.js"
      ],
      "matches": [
        "https://remax.ca/*",
        "https://*.remax.ca/*"
      ]
    }
  ]
}