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.

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