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We're still defaulting to 32-bit on systems where both are supported, but we hope to default to 64-bit around Firefox 55. We had to delay this due to issues with Flash, sandboxing, and Farmville 2: https://bugzil.la/1317995

The tracking bug for making 64-bit the default is https://bugzil.la/1340936

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So I can blame Farmville for Firefox not being 64-bit by default on Windows? :)

Yes :(

I dislike how the JIT don't comply with Windows x64 SEH requirements anyway. As a side note, I fixed NSS: https://bugzilla.mozilla.org/show_bug.cgi?id=1284375

Yuhong, is there a bug filed for the x64 SpiderMonkey JIT issues? What is the side effect of not following the x86-64 ABI for JIT code?

SEH exception handling don't work properly and debuggers don't show a proper callstack. For it to work properly, the JIT has to generate "function tables" to allow Windows to do stack walking.

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