Rated 4 out of 5 stars
holy Santa pants, this thing is amazing. i literally would lose my mind without it. the only reason it's 4 and not 5 stars is simply documentation on initial use and the fact that even though 'ask for pattern' is checked, when you check the 'set pattern as default' button, it doesn't change the default pattern. otherwise, flawless performance, even on very large selections (1500+ messages). we need to figure out how to retain this kind of functionality when Thunderbird goes the (crippling) way of Firefox and starts using WebExtensions.