Rated 5 out of 5 stars

Great when it works, but about 50% of the time once I change the subject line a big "x"pops displays on my screen, saying the editing failed. Often times though, if I close Thurnderbird and re-open it , the editing actually worked. Developers please fix this issue since I really need/like this add-on and would like to continue using it. Reading through the reviews here, it looks like others are having the same issue.