Examine source code of Zen Scroll

{
  "manifest_version": 2,
  "name": "Zen Scroll",
  "version": "1.0",
  "description": "When you scroll fast, gently remind: 'Thở chậm lại...'.",
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "styles.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "{348c85a2-3147-435c-8ef9-232da74d473e}"
    }
  }
}