Examine source code of Smooth X (twitter)

{
  "manifest_version": 3,
  "name": "Smooth X",
  "version": "1.2",
  "description": "Customizable smooth animations and interactive physics for X.com",
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "smoothxpro@yourdomain.local",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "action": {
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://x.com/*",
        "https://twitter.com/*"
      ],
      "css": [
        "smooth.css"
      ],
      "js": [
        "smooth.js"
      ],
      "run_at": "document_start"
    }
  ]
}