[cody@Arch2014p9 ~]$ aurt -S firefox-nightly
  -> Using [aur] repository
==> Resolving dependencies...
  -> firefox-nightly 0 -> 61.0a1.20180312-1
==> Retrieving build files...
Cloning into 'firefox-nightly'...
remote: Counting objects: 174, done.
remote: Compressing objects: 100% (133/133), done.
remote: Total 174 (delta 75), reused 110 (delta 41)
Receiving objects: 100% (174/174), 46.54 KiB | 254.00 KiB/s, done.
Resolving deltas: 100% (75/75), done.

==> Making package: firefox-nightly 61.0a1.20180312-1 (Mon Apr  2 13:15:22 PDT 2018)
==> Checking runtime dependencies...
==> Checking buildtime dependencies...
==> Retrieving sources...
  -> Found firefox-nightly.desktop
  -> Found vendor.js
  -> Downloading 20180402-firefox-61.0a1.en-US.linux-x86_64.tar.bz2...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 59.4M  100 59.4M    0     0   965k      0  0:01:03  0:01:03 --:--:--  928k
  -> Downloading 20180402-firefox-61.0a1.en-US.linux-x86_64.tar.bz2.asc...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   836  100   836    0     0   2723      0 --:--:-- --:--:-- --:--:--  2714
  -> Downloading 20180402-firefox-61.0a1.en-US.linux-x86_64.txt...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100    99  100    99    0     0    227      0 --:--:-- --:--:-- --:--:--   227
==> Validating source files with sha512sums...
    firefox-nightly.desktop ... Passed
    vendor.js ... Passed
==> Validating source_x86_64 files with sha512sums...
    20180402-firefox-61.0a1.en-US.linux-x86_64.tar.bz2 ... Skipped
    20180402-firefox-61.0a1.en-US.linux-x86_64.tar.bz2.asc ... Skipped
    20180402-firefox-61.0a1.en-US.linux-x86_64.txt ... Skipped
==> Verifying source file signatures with gpg...
    20180402-firefox-61.0a1.en-US.linux-x86_64.tar.bz2 ... Passed
==> Extracting sources...
  -> Extracting 20180402-firefox-61.0a1.en-US.linux-x86_64.tar.bz2 with bsdtar
==> Starting pkgver()...
==> Updated version: firefox-nightly 61.0a1.20180402-1
==> Entering fakeroot environment...
==> Starting package()...
==> Tidying install...
  -> Removing libtool files...
  -> Purging unwanted files...
  -> Removing static library files...
  -> Stripping unneeded symbols from binaries and libraries...
  -> Compressing man and info pages...
==> Checking for packaging issue...
==> Creating package "firefox-nightly"...
  -> Generating .PKGINFO file...
  -> Generating .BUILDINFO file...
  -> Generating .MTREE file...
  -> Compressing package...
==> Leaving fakeroot environment.
==> Finished making: firefox-nightly 61.0a1.20180402-1 (Mon Apr  2 13:16:45 PDT 2018)
==> Cleaning up...
renamed '/var/tmp/aurbuild.crl7IByX/firefox-nightly-61.0a1.20180402-1-x86_64.pkg.tar' -> '/var/cache/pacman/aur/firefox-nightly-61.0a1.20180402-1-x86_64.pkg.tar'
adding firefox-nightly 61.0a1.20180402-1
writing aur.db...
writing aur.files...
[sudo] password for cody: 
:: Synchronizing package databases...
 aur                                                         143.0 KiB  46.5M/s 00:00 [##################################################] 100%
:: Synchronizing package databases...
 aur                                                         221.0 KiB  54.0M/s 00:00 [##################################################] 100%
:: Starting full system upgrade...
 there is nothing to do
resolving dependencies...
looking for conflicting packages...

Packages (1) firefox-nightly-61.0a1.20180402-1

Total Installed Size:  152.29 MiB

:: Proceed with installation? [Y/n] 
(1/1) checking keys in keyring                                                        [##################################################] 100%
(1/1) checking package integrity                                                      [##################################################] 100%
(1/1) loading package files                                                           [##################################################] 100%
(1/1) checking for file conflicts                                                     [##################################################] 100%
(1/1) checking available disk space                                                   [##################################################] 100%
:: Processing package changes...
(1/1) installing firefox-nightly                                                      [##################################################] 100%
Optional dependencies for firefox-nightly
    pulseaudio: audio support [installed]
    ffmpeg: h.264 video [installed]
    hunspell: spell checking [installed]
    hyphen: hyphenation [installed]
    libnotify: notification integration [installed]
    networkmanager: location detection via available WiFi networks [installed]
    speech-dispatcher: text-to-speech
    startup-notification: support for FreeDesktop Startup Notification [installed]
:: Running post-transaction hooks...
(1/3) Updating icon theme caches...
(2/3) Arming ConditionNeedsUpdate...
(3/3) Updating the desktop file MIME type cache...
  
:: firefox-nightly: installed 

[cody@Arch2014p9 ~]$