Examine source code of youtube-transcript-free

{
  "manifest_version": 3,
  "name": "YouTube Transcript Extractor",
  "description": "Extract, search, and export YouTube transcripts. Free. No signup.",
  "version": "1.0.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "yt-transcript@ancplua",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": [
          "websiteContent"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "host_permissions": [
    "*://*.youtube.com/*",
    "*://*.googlevideo.com/*"
  ],
  "optional_host_permissions": [
    "*://api.openai.com/*",
    "*://api.anthropic.com/*",
    "*://generativelanguage.googleapis.com/*"
  ],
  "sidebar_action": {
    "default_panel": "sidepanel/index.html",
    "default_title": "YouTube Transcript"
  },
  "background": {
    "scripts": [
      "background/service-worker.js"
    ],
    "type": "module"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/watch*",
        "*://*.youtube.com/shorts/*",
        "*://*.youtube.com/embed/*",
        "*://*.youtube.com/live/*"
      ],
      "js": [
        "content/content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  }
}