Examine source code of Listing Gator

{
  "manifest_version": 3,
  "name": "Listing Gator",
  "version": "0.0.1",
  "description": "Download a summary of viewed Zillow data.",
  "icons": {
    "48": "gator_profile_48x48.png"
  },
  "action": {
    "default_title": "Listing Gator",
    "default_icon": {
      "48": "gator_profile_48x48.png"
    },
    "default_popup": "popup.html"
  },
  "permissions": [
    "scripting",
    "activeTab"
  ],
  "host_permissions": [
    "https://www.zillow.com/*",
    "https://zillow.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'none';"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "listinggator@example.org"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.zillow.com/*",
        "https://zillow.com/*"
      ],
      "js": [
        "contentRelay.js"
      ],
      "run_at": "document_end"
    }
  ]
}