NotebookLM Highlight to Explain

NotebookLM Highlight to Explain helps you move from reading sources to asking better questions in Google NotebookLM. Highlight text inside NotebookLM, press Cmd+E (macOS) or Ctrl+E (Windows/Linux/ChromeOS), then choose Explain, Example, or Summarize. The extension inserts a ready-to-send prompt into the NotebookLM chat panel. If the highlight comes from a source, it includes the source title when it can detect one. Useful for students, teachers, researchers, and anyone using NotebookLM to study documents, lecture notes, reports, or PDFs. Features: - Highlight NotebookLM text and open a focused prompt popup. - Add explain, example, or summarize prompts to NotebookLM chat. - Include the selected source title when the highlight comes from a source. - Keep the prompt editable before sending. - Works only on https://notebooklm.google.com/*. This is an independent tool and is not affiliated with Google or NotebookLM. --- What's new in v0.2.0: - Customizable Prompts: You can now edit the default prompt templates for Explain, Example, and Summarize. - Settings Page: Accessible via the new gear icon in the popup, where you can modify templates using {source} and {selection} placeholders. - Account Syncing: Custom prompt templates automatically save and sync across all your devices using Chrome Storage Sync. - Improved International Support: Enhanced chat box detection for non-English UI settings (supporting Turkish, Spanish, German, French, Italian, and Portuguese). - Selection Bug Fixes: Corrected source title extraction issues when highlighting text inside bulleted lists.