Browserr launches as an MCP-first browser for AI agents in one Rust binary

Browserr is a new MCP-first browser for AI agents shipped as a single roughly 120 MB Rust binary with no dependencies, exposing 42 MCP tools over JSON on loopback. It is built on the Servo engine and emphasizes fail-closed behavior: unauthenticated sockets get nothing, intercepted requests are denied after 5 s if unanswered, and every fetch/XHR is recorded in a ring buffer. It also offers human handoff in a native window with agent mutations paused, plus an append-only action log and a confirm gate on payment submits; the author positions it against Chromium wrappers and Lightpanda on local, trust-first operation.