Privacy: calGoogleSessionManager writing to syslog [linux]

NoOp <[email protected]> Sun, 13 Nov 2016 20:48:17 -0800
Newsgroups gmane.comp.mozilla.devel.calendar
Message-ID <[email protected]>
I notice that Mozilla Thunderbird and SeaMonkey calendar
extensions are writing to syslog:

[calGoogleSessionManager] Creating session <snip>
gnome-session[4983]: [calCachedCalendar] Performing playback operation
add on 0 items to <snip>@gmail.com
gnome-session[4983]: [calCachedCalendar] Performing playback operation
modify on 0 items to <snip>@gmail.com
gnome-session[4983]: [calCachedCalendar] Performing playback operation
delete on 0 items to <snip>@gmail.com
gnome-session[4983]: [calCachedCalendar] Doing changelog based sync for
calendar googleapi://<snip>/?calendar=<snip>%40gmail.com
gnome-session[4983]: [calGoogleSession] Token expired 1478xxxxx seconds
ago, resetting
gnome-session[4983]: [calGoogleCalendar] Logging in session <snip>

The information contains email account information, reminders, id tags
etc that I would prefer not be written to syslog. Is there a way to turn
this off?

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:49.0) Gecko/20100101 Firefox
OS 	Linux 4.4.0-47-generic/49.0 SeaMonkey/2.46
Lightning	5.1	true	{e2fda1a4-762b-4020-b5ad-a41df1933103}