https://chromewebstore.google.com/detail/notebooklm-extension-exte/jefclkefiknlccjcjmkkhlcfkdgcmgcm
NotebookLM Extension - ExtendLM - Chrome Web Store
NotebookLM extension: folders, tags, custom prompts, bulk notebook and source management, exports, merging, bulk imports and more.
notebooklmextensionchromewebstore