5점중 1점 받음

No, I am sorry, you're not right. I have double checked with fresh install and surely visible panel, still does nothing. In fact it does not matter if plugin is installed or not. Absolutely no effect at all.

이 검토는 현재 부가 기능의 이전 (2.0) 버전에 대한 것입니다.  전에 이 사용자는 이 부가 기능에 1개 검토를 했습니다.

What kind of OS do you use ? I tested addon on Windows and Linux. Do you see in Options addon number of saved messages or there is only zero ? Of course, the value indicates how many messages have been marked/displayed since the add-on was installed