google-httponly-cookies-require-network-tab-not-console
document.cookie in Chrome DevTools Console cannot read Google’s auth cookies because they are httpOnly. The only reliable extraction method is: DevTools → Network tab → reload NotebookLM page → click first request → Request Headers → right-click the cookie: line value → Copy value. This gives the full cookie string including all httpOnly cookies required for NotebookLM auth.
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