Here is what I did .

apt-get install build-essential fakeroot devscripts
apt-get build-dep firefox
apt-get install icecc
apt-get install clang-5.0
apt-get install python-dev
apt-get source firefox


cd firefox-58.0.2+build1/

export CC=clang-5.0
export CXX=clang++-5.0
export CCACHE_PREFIX=icecc


dpkg-buildpackage -b

After configure finish and it create stuff in obj-arm-linux-gnueabihf directory 
, when it started to compile I  CTRL+C it .
It generated 3 mozconfig files witch next I eddit to add clang to them too

pico ./debian/config/mozconfig
pico mozconfig 
pico browser/config/mozconfig

I added to all this mozconfig files at the top of files :

mk_add_options 'export CCACHE_PREFIX=icecc'
export CC=clang-5.0
export CXX=clang++-5.0


Next all I did was inside obj-arm-linux-gnueabihf directory the dir in witch it 
compiles all .
So I did not modified the firefox source ,I just adapted the generated 
backend.mk from obj-arm-linux-gnueabihf and restarted the build process teling 
him to not clean .
I had to modify :
firefox-58.0.2+build1/obj-arm-linux-gnueabihf/media/libpng/backend.mk and 
change "-std=c89" to "-std=gnu89"
firefox-58.0.2+build1/obj-arm-linux-gnueabihf/media/ffvpx/libavutil/backend.mk 
added to the last line -std=gnu99
firefox-58.0.2+build1/obj-arm-linux-gnueabihf/media/ffvpx/libavutil/backend.mk 
added to the last line -std=c99

Next I restarted the build process teling him to not clean so it did not
deleted my modified mozconfig and did not deleted obj-arm-linux-
gnueabihf directory , it just startd gain compilation using my
modifications .

dpkg-buildpackage -b -nc

If you see any other compile errors expect them to be from incorect
"-std=" , mising or wrong one and just modify backend.mk for the libs
witch fails in the firefox-58.0.2+build1/obj-arm-linux-gnueabihf/ and
restart using "dpkg-buildpackage -b -nc" so it to do not clean your
modifications .

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to firefox in Ubuntu.
https://bugs.launchpad.net/bugs/1711337

Title:
  Firefox crashes at start on armv7L after 55.0.1 update

Status in Mozilla Firefox:
  Expired
Status in firefox package in Ubuntu:
  Confirmed

Bug description:
  Firefox always crashes when launched after the 55.0.1 update on an
  Orange Pi PC Plus (a single-board computer similar to a Raspberry Pi),
  even in safe mode.

  I did a fresh install of Armbian (a Ubuntu Xenial 16.04 re-spin for
  ARM single-board computer) on a similar board (Orange Pi Plus 2e),
  installed Firefox and experienced the same problem--it won't load
  without crashing.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: firefox 55.0.1+build2-0ubuntu0.16.04.2
  Uname: Linux 3.4.113-sun8i armv7l
  AddonCompatCheckDisabled: False
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.25.
  ApportVersion: 2.20.1-0ubuntu2.10
  Architecture: armhf
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  jim        1138 F.... pulseaudio
   /dev/snd/controlC0:  jim        1138 F.... pulseaudio
  BuildID: 20170814194718
  Card0.Amixer.info:
   Card hw:0 'audiocodec'/'audiocodec'
     Mixer name : ''
     Components : ''
     Controls      : 12
     Simple ctrls  : 12
  Card1.Amixer.info:
   Card hw:1 'sndhdmi'/'sndhdmi'
     Mixer name : ''
     Components : ''
     Controls      : 1
     Simple ctrls  : 1
  Card1.Amixer.values:
   Simple mixer control 'hdmi audio format Function',0
     Capabilities: enum
     Items: 'null' 'pcm' 'AC3' 'MPEG1' 'MP3' 'MPEG2' 'AAC' 'DTS' 'ATRAC' 
'ONE_BIT_AUDIO' 'DOLBY_DIGITAL_PLUS' 'DTS_HD' 'MAT' 'WMAPRO'
     Item0: 'pcm'
  Channel: Unavailable
  CurrentDesktop: XFCE
  Date: Thu Aug 17 05:37:00 2017
  Extensions: extensions.sqlite corrupt or missing
  ForcedLayersAccel: False
  IncompatibleExtensions: Unavailable (corrupt or non-existant 
compatibility.ini or extensions.sqlite)
  IpRoute:
   default via 192.168.10.1 dev eth0 
   default via 192.168.10.1 dev wlan0  proto static  metric 600 
   169.254.0.0/16 dev eth0  scope link  metric 1000 
   192.168.10.0/24 dev eth0  proto kernel  scope link  src 192.168.10.107 
   192.168.10.0/24 dev wlan0  proto kernel  scope link  src 192.168.10.108  
metric 600
  Locales: extensions.sqlite corrupt or missing
  PciMultimedia:
   
  PciNetwork:
   
  Profiles: Profile0 (Default) - LastVersion=55.0.1/20170814194718
  RfKill:
   0: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: no
  RunningIncompatibleAddons: False
  SourcePackage: firefox
  Themes: extensions.sqlite corrupt or missing
  UpgradeStatus: No upgrade log present (probably fresh install)

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