A minimap for your endless AI chat transcripts

What it does

It’s a browser extension that adds small visual indicators to the scrollbar of AI chat pages, one per prompt you’ve sent. Click a marker, land on that prompt. It works via site-specific adapters for ChatGPT, Claude, and Gemini, each handling the DOM quirks of its host.

The interesting bit

The adapter pattern keeps platform-specific selectors quarantined from the core engine, so adding a new site means writing one adapter rather than forking the logic. The UI lives in Shadow DOM, which means the extension’s markers can’t be mangled by the host page’s CSS — a small detail that saves a lot of pain on pages that restyle aggressively.

Key highlights

• Site adapters for ChatGPT, Claude, and Gemini; Perplexity and Poe are on the roadmap
• Shadow DOM isolation prevents styling conflicts with the host page
• Debounced MutationObserver rendering to keep things fast on long threads
• Adapts to light and dark themes automatically
• Zero data collection — everything runs locally in the browser

Caveats

• The README describes a “Message Bus” for content-script/background communication as planned, not built — so the architecture is still settling
• No published benchmarks or store listing are referenced; you’d be loading it unpacked from a build

Verdict

If your chat sessions regularly run into the hundreds of messages, this is a genuinely useful quality-of-life tool. If you start a fresh thread every time, you’ll never notice it’s there.