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Fri, July 1707:34ToolsAPI & pricingInfra & costAPI & pricing guide

Puter Compiles Firefox to WebAssembly, Runs Browser in Browser

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Decision Brief

What changedPuter team compiles Firefox/Gecko to WebAssembly, enabling a full browser to run inside another browser.
Why it mattersCosts ~$25K in Claude and Fable tokens, demonstrating LLM-assisted programming's peak capability for large C++ projects, valuable for developers exploring in-browser browser execution.
Who should careAI coding tool users
Affected stackClaude
Source confidenceMedium · Reliable media or first-hand reporting

Using Claude Opus and Fable tokens (total cost ~$25K), the Puter team compiled Firefox/Gecko into WebAssembly, allowing the entire browser to operate within another browser. Firefox was chosen for its strong single-process support. The demo routes all traffic via WebSocket protocol (Wisp) through Puter's servers—since in-browser code cannot open arbitrary network connections. Puter claims end-to-end encryption; verification shows encrypted traffic to HTTPS sites, while HTTP requests are plaintext. After discussion on Hacker News, the team had to scale servers. The repository is firefox-wasm; WebkitWasm lacks an accessible online demo. For web developers studying cross-browser compatibility or seeking extreme sandboxing, this is a notable technical experiment.

Summary basis: official / RSS sourceCompiled from the source scope noted above; the original remains authoritative.

Sources

  • Simon Willison：Blog

    Hands-on notes on LLM tools, local models, and practical AI engineering.

  • Simon Willison：Blog

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