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Thanks for the reply, you know much more about it than I do.

What could an attacker do if they were able to trick the JIT into emitting evil native code?

I would say there is no simple answer to your question. However, I am not able to give you an authoritative answer to your question anyway. If you are interested, you can start here[1] or try and ping the moz-security people

[1] https://wiki.mozilla.org/Security/Sandbox

Thanks

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