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It needs detailed information on what it supposedly does and how to use it.

这个评论是针对附加组件的一个早期版本的(1.2.0)。  对这个附加组件,此用户曾发表过1个评价

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.