(/home/chris/firefox/plugin-container:14863): Gtk-CRITICAL

[Chris]

The complete syslog entry I see whenever I open this website - http://i
antiqueonline.ning.com/ is - https://pastebin.com/kzuSDyae as soon as I
close out the website it stops. But, as you can see it happens many
times in one second. Not sure if this is a Firefox error, or a Gnome
problem. Firefox is 52.0.2, rest of the system info is below.

lsb_release -rd
Description:	Ubuntu 16.04.2 LTS
Release:	16.04

apt-cache policy gdm3
gdm3:
  Installed: 3.18.3-0ubuntu2
  Candidate: 3.18.3-0ubuntu2
  Version table:
 *** 3.18.3-0ubuntu2 500

apt-cache policy gnome-shell
gnome-shell:
  Installed: 3.18.5-0ubuntu0.2
  Candidate: 3.18.5-0ubuntu0.2
  Version table:
 *** 3.18.5-0ubuntu0.2 500

-- 
Chris
KeyID 0xE372A7DA98E6705C
31.11972; -97.90167 (Elev. 1092 ft)
21:11:22 up 5:52, 1 user, load average: 0.43, 0.54, 0.48
Description:	Ubuntu 16.04.2 LTS, kernel 4.4.0-72-generic