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 which is abandoned and now breaks in newer builds of Thunderbird, this extension will provide one of the functions MailTweak used to.