Z 1 z 5 gwězdkow pógódnośony

It is logging every mail you open directly to /var/log/syslog !!!
Leaving a trace there. Using last thunderbird version.

Toś to pógódnośenje jo za pjerwjejšnu wersiju dodanka (3.8.0). 

This plugin does not log anything to syslog, not even sure that would be possible. Send me a screen shot if you would.