Thoughtmark — AI Notes & Outlines by cedric Lekene

Bookmark exact passages, code and math in Claude, ChatGPT, Gemini and DeepSeek. Organize into structured outlines, search across all your AI chats, and export clean PDF study guides and Markdown.

Available on Firefox for Android™

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About this extension

Never lose your train of thought in long AI conversations again. Thoughtmark lets you bookmark exact sentences, formulas, and code snippets inside Claude, ChatGPT, Google Gemini, and DeepSeek — jumping straight back to them with a single click.

Precision Bookmarking: Select any passage or code block in Claude, ChatGPT, Gemini, or DeepSeek and anchor it to your conversation outline.
Smart Auto-Recovery: Other extensions lose your place when long chats scroll. Thoughtmark automatically re-anchors your bookmarks as you navigate.
Global Search Across All Chats: Instantly search across every marked thought, quote, and note from one centralized dashboard.
Publication-Ready Export: Export your bookmarks and outlines as structured Markdown or formatted study guide PDFs complete with a Table of Contents.
100% Private & Local: Your notes and bookmarks stay on your computer. Thoughtmark stores data locally in your browser with zero personal data collection.

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Permissions and data

Required permissions:

Access browser tabs
Access your data for sites in the claude.ai domain
Access your data for sites in the chatgpt.com domain
Access your data for sites in the openai.com domain
Access your data for sites in the gemini.google.com domain
Access your data for sites in the deepseek.com domain
Access your data for claude.ai
Access your data for chatgpt.com
Access your data for chat.openai.com
Access your data for gemini.google.com
Access your data for chat.deepseek.com

Optional permissions:

Access your data for sites in the claude.ai domain
Access your data for sites in the chatgpt.com domain
Access your data for sites in the openai.com domain
Access your data for sites in the gemini.google.com domain
Access your data for sites in the deepseek.com domain
Access your data for sites in the supabase.co domain
Access your data for claude.ai
Access your data for chatgpt.com
Access your data for chat.openai.com
Access your data for gemini.google.com
Access your data for chat.deepseek.com

Data collection:

The developer says this extension doesn't require data collection.