I'm excited to announce that we have bona fide arm64 windows nightlies
available for download!


featuring full updater and installer support; see the
firefox-66.0a1.en-US.win64-aarch64* files in that directory.  Thanks
to Tom Prince for the updater work and Rob Strong and Matt Howell for
the installer work.

Please note that these builds are even nightlier than our normal
nightlies on other platforms: they have *not* gone through our usual
automated testing process, bugs are almost certain to crop up, etc.
etc.  That being said, I have been using builds off automation
(manually updating them) for several weeks now and have had a pleasant

There are still a few areas that we know need work: the Gecko profiler
is not functional, but should be by the end of the week.  The
crashreporter does not work.  Our top-tier JS JIT (IonMonkey) is not
turned on.  WebRTC is not turned on.  EME (Netflix, etc.) does not
work yet.  And so forth...Did I mention that these are nightlies?

If you use these builds and you find issues, please file bugs blocking:


so we can start to triage and prioritize what needs to be fixed.

Happy dogfooding!
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