Reading a dense article about monetary policy, I hit 'sterilized intervention' and did what I always do: opened a new tab, Wikipedia, read three paragraphs, came back, lost the thread. Multiplied by six terms per article, that's most of my reading time spent in context-switching overhead rather than actual comprehension.
So I built rabbitholes — a Chrome extension that renders an explanation inline next to your cursor the moment you release a text selection. No new tab. The tooltip lives in a shadow DOM overlay so it can't touch the host page's styles or layout.
The part that actually changed how I read: you can click any word inside the explanation to re-query on that term, or drag across a phrase to do the same. The explanation itself is a navigable surface. Each answer also surfaces two suggested rabbit-hole topics — the most interesting threads from wherever you currently are — one click to follow either.
For cases where a static explanation isn't enough, there's a globe icon that re-runs the query enriched with live Brave Search results. Source chips appear in the response so you can trace where anything came from.
A rabbit-hole counter tracks how many hops deep you've gone in a session. Follow the right chain of concepts and you'll eventually arrive at philosophy, which the extension treats as a milestone with a shareable trail.
Zero telemetry, no intermediary server. Requests go directly from your browser to api.anthropic.com and api.search.brave.com. Your Anthropic API key sits in chrome.storage.sync — encrypted, never leaves the browser.
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