Very handy. Small footprint. Excellent! Rated 5 out of 5 stars
Great to have something that provides one function. It does this well with a very small footprint :)
If only there were more extensions like this... or the functions were available within Thunderbird by default (however I do appreciate the Dev cycle).
If you previously used MailTweak (see http://forums.mozillazine.org/viewtopic.php?t=599803) which is abandoned and now breaks in newer builds of Thunderbird, this extension will provide one of the functions MailTweak used to.