Examine source code of Tiermaker Shuffle Button

{
  "manifest_version": 3,
  "name": "Tiermaker Shuffle Button",
  "version": "1.0",
  "description": "Adds a shuffle button to Tiermaker.",
  "permissions": [
    "activeTab"
  ],
  "host_permissions": [
    "*://*.tiermaker.com/create/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.tiermaker.com/create/*"
      ],
      "js": [
        "index.js"
      ],
      "css": [
        "index.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "tiermaker-shuffle-button@abnormalnormality.github.io",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}