Examine source code of Facebook-Sort

{
  "manifest_version": 3,
  "name": "Facebook-Sort",
  "version": "5",
  "browser_specific_settings": {
    "gecko": {
      "id": "{0000face-0000-0000-0000-00000000face}",
      "strict_min_version": "109.0"
    }
  },
  "host_permissions": [
    "https://www.facebook.com/marketplace/*"
  ],
  "description": "Automate filtering and sorting facebook marketplace search results.",
  "icons": {
    "48": "facebook-sort-48.jpg"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.facebook.com/marketplace/*"
      ],
      "js": [
        "facebook-sort.js"
      ]
    }
  ]
}