It successfully build a deb .I build all with gcc except gfx/skia build with 
clang .
There is again a crash but It looks now is not in _sk_xor__vfp4 the asm code 
where it crash is different from the asm code of _sk_xor__vfp4  .

firefox -g
GNU gdb (Ubuntu 7.11.1-0ubuntu1~16.5) 7.11.1
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Reading symbols from /usr/lib/firefox/firefox...(no debugging symbols 
(gdb) run
Starting program: /usr/lib/firefox/firefox 
Cannot parse expression `.L1185 4@r4'.
warning: Probes-based dynamic linker interface failed.
Reverting to original interface.

[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/arm-linux-gnueabihf/".
[New Thread 0xf2522450 (LWP 2431)]
[New Thread 0xf1d22450 (LWP 2432)]
[Thread 0xf1d22450 (LWP 2432) exited]
[New Thread 0xf1d22450 (LWP 2433)]
[New Thread 0xed17b450 (LWP 2434)]
[New Thread 0xec97b450 (LWP 2435)]
[New Thread 0xec17b450 (LWP 2436)]
[New Thread 0xf12ff450 (LWP 2437)]
[New Thread 0xf10ff450 (LWP 2438)]
[New Thread 0xeb97b450 (LWP 2439)]
[New Thread 0xeb77b450 (LWP 2440)]
[New Thread 0xeb57b450 (LWP 2441)]
[New Thread 0xeb37b450 (LWP 2442)]
[New Thread 0xeb17b450 (LWP 2443)]
Thread 1 "firefox" received signal SIGSEGV, Segmentation fault.
0xf4c3dcb4 in ?? () from /usr/lib/firefox/
(gdb) disas /r 0xf4c3dca0,0xf4c3dcd0
Dump of assembler code from 0xf4c3dca0 to 0xf4c3dcd0:
   0xf4c3dca0:  9b 68   ldr     r3, [r3, #8]
   0xf4c3dca2:  05 eb 83 03     add.w   r3, r5, r3, lsl #2
   0xf4c3dca6:  16 46   mov     r6, r2
   0xf4c3dca8:  0f 46   mov     r7, r1
   0xf4c3dcaa:  98 44   add     r8, r3
   0xf4c3dcac:  20 99   ldr     r1, [sp, #128]  ; 0x80
   0xf4c3dcae:  d9 e9 00 23     ldrd    r2, r3, [r9]
   0xf4c3dcb2:  82 46   mov     r10, r0
=> 0xf4c3dcb4:  c1 e9 00 23     strd    r2, r3, [r1]
   0xf4c3dcb8:  d9 f8 04 30     ldr.w   r3, [r9, #4]
   0xf4c3dcbc:  7b 33   adds    r3, #123        ; 0x7b
   0xf4c3dcbe:  00 f0 4b 81     beq.w   0xf4c3df58
   0xf4c3dcc2:  b1 69   ldr     r1, [r6, #24]
   0xf4c3dcc4:  c1 f3 56 25     ubfx    r5, r1, #9, #23
   0xf4c3dcc8:  21 f4 ff 71     bic.w   r1, r1, #510    ; 0x1fe
   0xf4c3dccc:  21 f0 01 01     bic.w   r1, r1, #1

I dnt know where this asm code belongs too . I dnt know in what function
it crash , but is not in sk jumper generated .

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  Firefox crashes at start on armv7L after 55.0.1 update

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

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
   /dev/snd/controlC1:  jim        1138 F.... pulseaudio
   /dev/snd/controlC0:  jim        1138 F.... pulseaudio
  BuildID: 20170814194718
   Card hw:0 'audiocodec'/'audiocodec'
     Mixer name : ''
     Components : ''
     Controls      : 12
     Simple ctrls  : 12
   Card hw:1 'sndhdmi'/'sndhdmi'
     Mixer name : ''
     Components : ''
     Controls      : 1
     Simple ctrls  : 1
   Simple mixer control 'hdmi audio format Function',0
     Capabilities: enum
     Items: 'null' 'pcm' 'AC3' 'MPEG1' 'MP3' 'MPEG2' 'AAC' 'DTS' 'ATRAC' 
     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)
   default via dev eth0 
   default via dev wlan0  proto static  metric 600 dev eth0  scope link  metric 1000 dev eth0  proto kernel  scope link  src dev wlan0  proto kernel  scope link  src  
metric 600
  Locales: extensions.sqlite corrupt or missing
  Profiles: Profile0 (Default) - LastVersion=55.0.1/20170814194718
   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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