Rated 3 out of 5 stars

My hard drive died this weekend and so I had to buy a new one and to reinstall thunderbird on it, including importing my backed up message filters, which were exported using the original version of the plugin. The plugin succeeded the import only partially: the list of filters was imported and for every filter the lists of the filtered fields was imported as well. However, every single filter gave me an error message saying that the destination folder, into which a filter was supposed to move messages on the server (I use IMAP), does not exists, and so the folder paths were left empty. I had to manually set again the destination folders for all my filters (and I have dozens of them).

This review is for a previous version of the add-on (1.0.1). 

Hi. Thanks for using this plugin.
The problem you have encountered and described exists sadly because of the original plugin's bug which was introduced by its original author. I don't know whether and when I will be able to fix it or not (it is a nuisance since I've encountered it myself). The purpose was to make it compatible with newer versions of thunderbird. However, I do plan to clean up the code and make it better introducing bug fixes in newer versions (if any).
Thanks for the bug report :)