Rated 1 out of 5 stars
It needs detailed information on what it supposedly does and how to use it.This review is for a previous version of the add-on (1.2.0). This user has a previous review of this add-on.
the "fonf" - button activates the function as in the menu "Tools" - "Runs Filters on Folder".
it's easier to reach the function with that button.
the "Filter" - button only opens the "Message Filter" dialog, where you can handle your message filter.