Examine source code of Facebook URL Blocker

{
  "manifest_version": 3,
  "name": "Facebook Blocker",
  "short_name": "Facebook Blocker",
  "version": "1.0.0",
  "description": "Blocks facebook.com, messenger.com, fb.com, and facebook.net with a toggle feature and typing challenge.",
  "permissions": [
    "storage",
    "declarativeNetRequest",
    "alarms"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_icon": "icons/icon48.png",
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'none';"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "facebook-blocker@joshyates",
      "strict_min_version": "130.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}