Open Claude in Chrome

Official Claude in Chrome gives you 58 blocked domains and two browsers.
Open Claude in Chrome gives you the whole web.
_{Clean-room reimplementation of Anthropic's browser extension. No blocklist. Any Chromium browser. 100% feature & performance parity.
by noemica}

What's different · Install · Imitation learning · Architecture · Demo · How I built it

_{Watch Claude navigate Tinder, Reddit, and Robinhood — sites the official extension can't reach.}

The official Claude in Chrome extension gives Claude Code full browser automation — as long as you stay within Anthropic's allowlist of "safe" sites. Open Claude in Chrome is a clean-room reimplementation that strips the restrictions while keeping all 21 MCP tools and matching the official extension's performance.

What's Different

Blocked Domains in the Official Extension

Open Claude in Chrome has none of these restrictions.

Does it actually match the official extension?

Yes — and rather than assert it, here is a benchmark. Read the full study →

17 arms, each run over the same 12 held-out tasks from the REAL web-agent benchmark, same model and effort throughout (Sonnet, medium). What it found:

• Parity, out of the box. The official extension and this harness, both cold, are statistically indistinguishable: 2.04 vs 1.95 min/task and 31.4 vs 32.6 turns, at p=0.44 and p=0.67 on a paired permutation test, with identical accuracy. They differ only in per-action overhead — 0.31s vs 0.12s per browser action, 2.7× less.
• A higher ceiling. The best method in the study lands **23

... View full README on GitHub