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Firefox/Gecko was chosen as the browser to port because it has strong single-process support.

The team selected Firefox's Gecko engine specifically for its strong single-process support, which made it a better fit for compiling to WebAssembly. ✦ AI generated

Simon Willison · Simon Willison's Weblog · 2026-07-16 · original ↗

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They chose Firefox/Gecko because it has strong single-process support. The project took an estimated $25,000 of Claude Opus and Fable tokens, taking advantage of a Claude Max subscription plan.

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✳ Firefox ✳ Gecko

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provides context → Puter has compiled the entire Firefox browser to WebAssembly, so the whole browser runs inside another browser.Simon Willison · Simon Willison's Weblog