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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.

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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