firefox-47 MessageChannel.cpp ABORT

[David Brownlee <abs%absd.org@localhost>]

Is anyone else seeing an issue with firefox-4.7 where it seemingly
randomly exits:

(process:4491): GLib-CRITICAL **: g_path_get_basename: assertion
'file_name != NULL' failed
[Child 4491] ###!!! ABORT: Aborting on channel error.: file
/var/obj/pkg/www/firefox/work/firefox-47.0.1/ipc/glue/MessageChannel.cpp,
line 2027
[Child 4491] ###!!! ABORT: Aborting on channel error.: file
/var/obj/pkg/www/firefox/work/firefox-47.0.1/ipc/glue/MessageChannel.cpp,
line 2027
[1]   Segmentation fault      firefox

This happened for me with 4.7 when tested a couple of weeks back, and
now 47.01nb1, latest pkgsrc, netbsd-7 amd64. firefox46, built against
same pkgsrc tree does not show any issues.

I've tried resetting firefox but the issue returns. I've had it exit
when loading a page, and also several seconds after a page has
apparently finished loading.