Why does Firefox crash every time I update it?

Just a question, in case anyone has an answer: why does the Firefox port crash every time I update it?
Example from today's update, from /var/log/messages:
Feb  9 21:31:09 kg-core1 pkg: firefox-44.0,1 deinstalled
Feb  9 21:31:17 kg-core1 pkg-static: firefox-44.0.1,1 installed
Feb  9 21:32:11 kg-core1 kernel: pid 97839 (firefox), uid 1001: exited on signal 10 (core dumped)
I keep Firefox running on my workstation all the time (except for when it crashes), and I keep it running even when doing a portupgrade of the Firefox port. After the port is upgraded, I just quit Firefox and start it again. This used to work fine, but recently (as in the last 1 - 2 months) Firefox crashes while portupgrade is doing it's thing.
Details: I'm running FreeBSD 9.3-stable on my workstation:
tingo@kg-core1$ uname -a
FreeBSD kg-core1.kg4.no 9.3-STABLE FreeBSD 9.3-STABLE #1 r287724: Sun Sep 13 00:23:47 CEST 2015
  root@kg-core1.kg4.no:/usr/obj/usr/src/sys/GENERIC  amd64
I would guess it's a file monitoring issue of some sort, normally there can't be any issue with replacing the main executable while the program is running because FreeBSD is designed to allow that.
I was guessing it reads something from disk that it is picky but running /usr/share/dtrace/toolkit/opensnoop -p `pgrep firefox` doesn't seem to suggest it loads in any library after it is already running.
I see these in /var/log/messages sometimes when starting Firefox, but I'm not sure it is related:
Feb 17 19:12:55 kg-core1 kernel: pid 19068 (gvfsd), uid 1001: exited on signal 5
Feb 17 19:12:55 kg-core1 kernel: pid 24669 (gvfsd), uid 1001: exited on signal 5
Rebuild gvfs with all options off. That works for me. Of course, then gvfs does not support any of those extra things.
Let's see
root@kg-core1# cd /usr/ports/devel/gvfs;make showconfig
===> The following configuration options are available for gvfs-1.24.2:
  AFC=off: Apple device support
  AVAHI=on: Zeroconf support via Avahi
  CDDA=off: CDDA (enables HAL)
  FUSE=off: FUSE (Filesystem in Userspace) support
  GPHOTO2=off: Gphoto 2 camera support (enables HAL)
  HAL=off: HAL (Hardware Abstraction Layer) support
  SAMBA=on: Samba support
===> Use 'make config' to modify these settings
the only one I use is Avahi. I wonder if turning off Samba will help?
Firefox 47.0.1 crashes my computer everytime, when i I attempt to upload images to Drupal CMS on standard URL

# uname -a
FreeBSD workstation1.home 10.3-PRERELEASE FreeBSD 10.3-PRERELEASE #0 r297540: Mon Apr  4 13:45:28 MSK 2016  denis@workstation1.home:/usr/obj/usr/src/sys/GENERIC  amd64
DenisVS you're running an unsupported FreeBSD version. FreeBSD 10.3 was released in April, invalidating any and all pre-releases, betas, release candidates, etc. versions.
You were right.
During of tuning the system my Xorg became reboot my PC.
After new install all bugs, not only that, was gone!
I like FreeBSD :)
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