Examine source code of FB Unlocker

{
  "manifest_version": 3,
  "name": "FB Unlocker",
  "description": "Developed by social-unlocker.com",
  "version": "4.4.4",
  "action": {
    "default_popup": "unlocker.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "permissions": [
    "activeTab",
    "scripting",
    "cookies"
  ],
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "host_permissions": [
    "https://*.facebook.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://*.facebook.com/*"
      ],
      "js": [
        "popup.js"
      ]
    }
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "blackurd@protonmail.com"
    }
  }
}