Simon Willison 7/16/2026

Firefox in WebAssembly

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This article discusses an impressive project where Puter compiled Firefox/Gecko to WebAssembly, enabling the entire browser to run inside another browser like Chrome. It highlights the use of single-process support in Gecko, the estimated $25,000 in AI token costs reduced by a subscription plan, and the technical requirement of proxying all traffic over WebSocket via the Wisp protocol for network connectivity. The demo supports end-to-end encryption, verified by inspecting WebSocket messages. The article also mentions a similar WebKit-to-WASM project without a live demo. This is a tech-focused piece on browser virtualization and WebAssembly.

Firefox in WebAssembly

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