same here with firefox 59.0.2+build1-0ubuntu0.16.04.3

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  Firefox and plugin-container (Chrome_ChildThr): segfault at 0 ip, sp
  error 6 in plugin-container/

Status in firefox package in Ubuntu:

Bug description:

  Some days ago, Firefox unexpectedly has been closed after a couple of
  hours (mostly viewed: YouTube and some other websites). Next, a dialog
  box related to the Mozilla Crash Reporter appeared - with message,
  that reporter is disabled (which I did earlier via 'about:config' and
  *datareporting.healthreport.service.enabled* key set to _false_) and
  no crash report is available even via 'about:crashes' etc.

  After this situation two entries appeared in the log files: first
  related to the AppArmor and second: plugin-container segfault. By the
  way: in the same time there was an update for flash-plugin available
  (see: 1).

  Anyway, 'LastCrash' file (which can be found in
  ~/.mozilla/firefox/Crash Reports/ directory) contains only:
  1484142985. Just like all the others files in this directory. There
  are also two folders called: 'events' and 'pending'. But they are
  completely empty. However, system log files, such as
  '/var/log/kern.log' or '/var/log/syslog', contains an interesting

  ● Jan 11 14:56:25 t4 kernel: [ 4161.295639] type=1400
  audit(1484142985.517:46): apparmor="DENIED" operation="open"
  parent=2818 profile="/usr/lib/firefox/firefox{,*[^s][^h]}"
  name="/proc/2818/task/" pid=3253 comm="firefox" requested_mask="r"
  denied_mask="r" fsuid=1000 ouid=1000

  ● Jan 11 14:56:25 t4 kernel: [ 4161.540727] Chrome_ChildThr[2890]:
  segfault at 0 ip b76df673 sp b1efe9f0 error 6 in plugin-

  As we know, thanks to the plugin-container, plugins are separated from
  the browser process, making it more stable, right? So now if a plugin
  crashes, Firefox should remains unharmed. It looks like this is a
  known problem (see: 2, 3).

  By the way; on Moday, 16 January, Firefox has been closed again - no
  action from my side. Log files contain the same entries as above:

  ● Jan 16 16:39:35 t4 kernel: [14373.711834] type=1400
  audit(1484581175.931:48): apparmor="DENIED" operation="open"
  parent=2532 profile="/usr/lib/firefox/firefox{,*[^s][^h]}"
  name="/proc/2532/task/" pid=3389 comm="firefox" requested_mask="r"
  denied_mask="r" fsuid=1000 ouid=1000

  ● Jan 16 16:39:36 t4 kernel: [14373.934394] Chrome_ChildThr[3041]:
  segfault at 0 ip b76f8673 sp b1efe9f0 error 6 in plugin-

  Anyway, after adding these two rules to the Firefox profile,
  everything seems to be OK and there is not DENIED message for
  "/proc/*/task/" entry anymore (so the first issue is solved):

  owner @{PROC}/[0-9]*/task/ r,
  owner @{PROC}/[0-9]*/task/* r,

  NOTE: This problem occurs when adobe-flash plugin is not activated and
  is permanently disabled and also when is used/enabled. Here are some
  informations about versions etc.:

  ● Firefox: 50.1.0
  ● Flash:
  ● Linux: 3.2.0-120-generic-pae (3.2.79) i686
  ● AppArmor: 2.7.102-0ubuntu3.10
  ● Release: 12.04.5 LTS (via `lsb_release -a` command)

  Best regards.

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