Cloudflare built a browser with no Chromium inside — for agents, not people
Kitesurf is a headless browser written in Rust and WebAssembly that runs inside V8 isolates on Cloudflare Workers, with no Chromium underneath it. Cloudflare's own benchmarks put it at 4.7x less memory and 3.1x less CPU than Chromium for screenshots, in exchange for being roughly 1.7x slower in wall time. It passes more than 215,000 Web Platform Tests and speaks the Chrome DevTools Protocol, so Puppeteer, Playwright and MCP clients work against it unchanged. Free during the beta through Browser Run, with open-sourcing promised.
Why it mattersEvery agent browsing the web today rents a full desktop browser it does not need — tabs, extensions, 60fps rendering — and that cost is what stops you from giving a million agents one browser each. Stripping it down is also a security move: the point of an isolate is that a hostile web page cannot reach past the agent reading it. Cloudflare is betting the browser becomes infrastructure for software, not a window for humans.
▶ Related video: Cloudflare Browser Run: How to Solve CAPTCHAs & Logins for AI Agents
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