Examine source code of Bulk Delete for YouTube

{
  "manifest_version": 3,
  "name": "Bulk Delete for YouTube",
  "version": "0.1.1",
  "description": "Clean up YouTube in bulk: Watch Later, Liked videos, history, playlists. Preview, confirm, verify. Any language.",
  "permissions": [
    "storage",
    "activeTab"
  ],
  "host_permissions": [
    "https://www.youtube.com/*",
    "https://extensionpay.com/*",
    "https://*.extensionpay.com/*"
  ],
  "background": {
    "scripts": [
      "config.js",
      "ExtPay.js",
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html",
    "default_title": "Bulk Delete for YouTube",
    "default_icon": {
      "16": "icon16.png",
      "48": "icon48.png",
      "128": "icon128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "js": [
        "engine.js",
        "adapter.js",
        "content.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://extensionpay.com/*",
        "https://*.extensionpay.com/*"
      ],
      "js": [
        "ExtPay.js"
      ],
      "run_at": "document_start"
    }
  ],
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "bulk-delete-youtube@bulkdeletetools.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}