Examine source code of ScribbleHub Navigator

{
  "manifest_version": 3,
  "name": "ScribbleHub Navigator",
  "version": "1.0",
  "description": "Navigate chapters on ScribbleHub using arrow keys.",
  "icons": {
    "128": "logo.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.scribblehub.com/*chapter*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "scribblehub-navigator@example.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}