Firefox Compiled to WebAssembly Runs Entirely Inside a Browser Tab

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Developers have successfully compiled the full Firefox browser — including the Gecko rendering engine, all UI components, and the SpiderMonkey JavaScript engine — into WebAssembly, allowing it to run inside another browser. The project features end-to-end encryption using the WISP protocol for TCP-over-WebSockets, along with an experimental WASM-to-JS JIT compiler aimed at improving site performance. The effort was described as a boundary-pushing experiment rather than a production tool, and reportedly cost over $25,000 in AI tokens for debugging and JIT research. For users seeking a lighter alternative, the team also released browser.js, a more RAM-efficient browser-in-browser solution available on GitHub.

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ProgrammingDEV Community ·

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