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1. SUPERSEDED by https://github.com/mozilla-firefox/firefox. Read-only Git mirror of the Mercurial gecko repositories at https://hg.mozilla.org

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2. A virtual machine for executing programs written in Hack.

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3. Servo aims to empower developers with a lightweight, high-performance alternative for embedding web technologies in applications.

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4. ChakraCore is an open source Javascript engine with a C API.

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5. Test suites for Web platform specs — including WHATWG, W3C, and others

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6. host coding competitions anywhere, anytime

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