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The bitness choice (and that entire screenshotted dialog) is only present if you select "Advanced Options" in the bottom left of the installer's first screen, it's not something that we force every user through.

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Ah, OK, that makes more sense. Thanks.

What's the default if you don't select "Advanced Options", btw?

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

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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