We won't update the download page with Windows 64 builds for 42. We are waiting for some partner changes before making that public.
However, the binaries will be available on the ftp for testing:
https://ftp.mozilla.org/pub/mozilla.org/firefox/releases/latest/
ソ－ス：https://bugzilla.mozilla.org/show_bug.cgi?id=1181014#c24
公開されるといいなあ。
