Reading a dense article, I hit a term I half-know, highlight it, and get an explanation — which contains another term I half-know. Old workflow: open tab, open another tab, lose the original page somewhere in tab 47, give up. New workflow: I built rabbitholes to handle this inside the tooltip itself.
Click any word in the explanation and it re-queries inline. Drag across a phrase to take that as the new prompt. Every answer ends with two suggested rabbit-hole topics — the most interesting threads from wherever you landed. A counter in the corner tracks how many hops deep you've gone.
The shadow DOM tooltip renders next to your cursor without touching the host page's DOM, so the article you started reading is still there, unchanged, when you surface. Requests go directly from your browser to api.anthropic.com — no intermediary server, no analytics, no telemetry. Manifest V3. Your Anthropic API key lives in chrome.storage.sync, encrypted, and never leaves the browser.
There's also a globe icon that re-answers the query enriched with Brave Search results, with source chips you can click through. Useful when you want primary sources rather than a synthesis.
The thing I didn't expect: the rabbit-hole counter doubles as a kind of intellectual receipt. Hit 'philosophy' from enough starting points and you get a shareable trail of the path you took.
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