Examine source code of UWorld Customizer

{
  "manifest_version": 3,
  "name": "UWorld Customizer",
  "version": "0.1.2",
  "description": "Customize the UWorld review interface by hiding selected feedback elements and layout panels.",
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "@uworld-customizer",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "16": "assets/icon16.png",
    "32": "assets/icon32.png",
    "48": "assets/icon48.png",
    "128": "assets/icon128.png"
  },
  "action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "assets/icon16.png",
      "32": "assets/icon32.png",
      "48": "assets/icon48.png",
      "128": "assets/icon128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://apps.uworld.com/*"
      ],
      "js": [
        "content/hide-elements.js"
      ],
      "run_at": "document_idle"
    }
  ]
}