Reading an article about CRISPR, hit a term like 'guide RNA,' and you have a choice: open a new tab and lose your place, or skip it and stay shallow. I wanted a third option — the answer right there, next to my cursor, without touching the page.
rabbitholes is a Chrome extension that renders an explanation in a shadow-DOM tooltip on any text you highlight. Shadow DOM so it doesn't interfere with host page styles or scripts. Requests go directly from your browser to api.anthropic.com — no intermediary server, no telemetry, no analytics.
The part I actually use most: every explanation ends with two suggested rabbit-hole topics. One click and you're one hop deeper. The extension tracks how many hops you've taken; long sessions develop a shareable trail. If you've ever clicked your way from 'guide RNA' to 'the history of the central dogma' in six steps, you know the feeling.
When the inline answer isn't enough, there are two escape hatches. A pencil icon opens a free-form follow-up input that inherits the current context. A globe icon re-answers the query enriched with live Brave Search results, with source chips you can click through.
You click any word in the explanation to dig into it, or drag across a phrase to explore that instead. The whole thing stays on the page you were reading.
Setup is one Anthropic API key stored in chrome.storage.sync — encrypted, never leaves the browser. Manifest V3.
github.com/robertnowell/rabbitholes
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