Examine source code of NotebookLM URL Adder

{
  "manifest_version": 2,
  "name": "NotebookLM URL Adder",
  "version": "1.0.0",
  "description": "Автоматическое добавление URL в NotebookLM",
  "author": "Михайло",
  "homepage_url": "https://t.me/SEO_entity",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "*://notebooklm.google.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "NotebookLM URL Adder",
    "default_icon": {
      "16": "icon16.png",
      "32": "icon32.png",
      "48": "icon48.png",
      "128": "icon128.png"
    }
  },
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "web_accessible_resources": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "{9c5df3e9-78f0-4966-903c-38ff6cb4aee4}"
    }
  }
}