Just downloaded the .dmg to update to a fresh install of nightly and the installation fails at mount. Error message specifies "no mountable filesystem".
Can't reproduce on my 10.12.5 machine. Might be something like a corrupt or unfinished download. Can you verify the checksum and size of your DMG against the ones in ? For reference, on today's build the size is 63740154 bytes and the hashes are: sha512 847356b8ae212b1523cd76b284c4dc9c9e4f6492c7dbe8df4a0272c708e930c967b847a9e7f081dbd812e7cd397478eef3deb5304e58392f03a9a1c4ef89cf63 sha256 db1358e0ab91c86116a26389282793a69d9cbb41a1bd011cf61f3e737ea3302a  http://archive.mozilla.org/pub/firefox/nightly/latest-mozilla-central/firefox-56.0a1.en-US.mac.checksums
Perhaps it was a sketchy download. I did try to DL the image again yesterday and after several downloads and ended up installing the en-GB version. Unfortunately I didn't leave the en-US dmg file lying around (so I can not provide the checksum). Today's DMG works perfectly fine though.
Status: NEW → RESOLVED
Last Resolved: a year ago
Resolution: --- → FIXED
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