Examine source code of Vdubo - YouTube Video Dubbing Online | AI Subtitle Translate & Dub

{
  "version": "2.5.5",
  "action": {
    "default_icon": {
      "16": "images/icon.png",
      "32": "images/icon.png",
      "48": "images/icon.png",
      "128": "images/icon.png"
    },
    "default_popup": "popup.html"
  },
  "background": {
    "service_worker": "background.bundle.js"
  },
  "content_scripts": [
    {
      "js": [
        "relay.bundle.js"
      ],
      "matches": [
        "https://www.youtube.com/*",
        "https://m.youtube.com/*"
      ],
      "run_at": "document_start",
      "world": "MAIN"
    },
    {
      "js": [
        "PreContent.bundle.js"
      ],
      "matches": [
        "https://www.youtube.com/*",
        "https://m.youtube.com/*"
      ],
      "run_at": "document_start"
    },
    {
      "css": [
        "css/loading.css",
        "css/loading.min.css",
        "css/introjs.min.css"
      ],
      "js": [
        "content.bundle.js"
      ],
      "matches": [
        "https://www.youtube.com/*",
        "https://m.youtube.com/*"
      ],
      "run_at": "document_end"
    }
  ],
  "default_locale": "en",
  "description": "__MSG_extensionDescription__",
  "externally_connectable": {
    "matches": [
      "https://*.coolsunup.com/*"
    ]
  },
  "host_permissions": [
    "https://*.coolsunup.com/",
    "https://www.youtube.com/",
    "https://m.youtube.com/"
  ],
  "icons": {
    "16": "images/icon.png",
    "32": "images/icon.png",
    "48": "images/icon.png",
    "128": "images/icon.png"
  },
  "manifest_version": 3,
  "name": "__MSG_extensionName__",
  "permissions": [
    "tabs",
    "storage"
  ],
  "update_url": "https://clients2.google.com/service/update2/crx",
  "web_accessible_resources": [
    {
      "matches": [
        "https://www.youtube.com/*",
        "https://m.youtube.com/*"
      ],
      "resources": [
        "images/*"
      ]
    }
  ]
}