NotebookLM Mindmap Extractor

Chrome extension for extracting mindmaps from NotebookLM and exporting them to common mindmap formats.

Features

• Detects mindmap nodes from notebooklm.google.com
• Reconstructs hierarchy using SVG position and connection analysis
• Exports to:
  • FreeMind (.mm)
  • Generic XML (.xml)
  • OPML (.opml)
  • Excalidraw (.excalidraw) (optimised for great outputs)
• Debug mode for inspecting detected nodes, levels, connections, and page HTML
• Download support via the Chrome Downloads API

Files

• manifest.json — Chrome extension manifest (MV3)
• popup.html — extension popup UI
• popup.js — popup logic, export generation, downloads
• content.js — NotebookLM page extraction and hierarchy building
• background.js — install/download listeners
• styles.css — button styles

Install

1. Open Chrome and go to chrome://extensions
2. Enable Developer mode
3. Click Load unpacked
4. Select this folder

Usage

1. Open a NotebookLM mindmap page
2. Click the extension icon
3. Click Detect Mindmap
4. Choose an export format
5. Click Export Mindmap

Debug mode

Use Debug Mode if detection is off. It lets you:

• inspect all detected nodes
• view X-level grouping
• select a different root node
• download the full page HTML

Permissions

• activeTab
• scripting
• storage
• downloads

Notes

• The extension only runs on https://notebooklm.google.com/*
• Extraction depends on NotebookLM’s current DOM/SVG structure, so UI changes on Google’s side may break detection

Development

To modify locally:

1. Edit the extension files
2. Reload the extension in chrome://extensions
3. Test on a NotebookLM mindmap