Examine source code of ChatGPT TOC

{
  "manifest_version": 2,
  "name": "ChatGPT TOC Overlay",
  "version": "3.0.1",
  "description": "Local table of contents overlay for ChatGPT conversations.",
  "browser_specific_settings": {
    "gecko": {
      "id": "chat-toc@local",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "tabs",
    "storage",
    "https://chatgpt.com/*",
    "https://chat.openai.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_title": "ChatGPT TOC"
  },
  "content_scripts": [
    {
      "matches": [
        "https://chatgpt.com/*",
        "https://chat.openai.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ]
}