Examine source code of Facebook Blocker

{
  "manifest_version": 3,
  "name": "Simple Facebook Blocker",
  "version": "1.0",
  "description": "Blocks access to Facebook.",
  "host_permissions": [
    "*://www.facebook.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{ac2a3987-8b39-4cf9-b4ed-13d68ac22c58}"
    }
  }
}