firefox 44.0.2 won't start: error from libgiofam.so

[Winston]

After "pkg upgrade firefox" from 44.0,1 to 44.0.2,1,
firefox won't run.  It exits with:

/usr/local/lib/gio/modules/libgiofam.so:
    Undefined symbol "g_local_directory_monitor_get_type"

pkg says libgiofam.so is owned by package gio-fam-backend.

gio-fam-backend version: 2.28.8_1

# pkg query %rn gio-fam-backend
xf86-video-radeonhd

# pkg query %rn xf86-video-radeonhd

# pkg query %v xf86-video-radeonhd
1.3.0_5

Is xf86-video-radeonhd something previously used by xorg-drivers but now
not?  ls -lu of its driver files indicates they haven't been accessed in
a couple of months, even though I just rebooted the system to ensure the
problem wasn't some kind of consistency error.

All pieces were installed from pkg repository packages, not from ports.

freebsd-version: 10.2-RELEASE-p12

uname -a:
  FreeBSD {host} 10.2-RELEASE-p9 FreeBSD 10.2-RELEASE-p9 #0: Thu Jan 14 01:32:46 UTC 2016
  root at amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC  amd64

Firefox 44.0,1 ran OK just before the pkg upgrade to 44.0.2,1.

Thanks,
 -WBE