Rated 3 out of 5 stars

Would be great, but if I make the header compact then try to make it normal size again with the '+' button the header disappears altogether, and the only way to get headers back is to restart Thunderbird. Makes it pretty well unusable. Is this something to do with my setup or do others find the same thing?

I'm on V3 rc2

This review is for a previous version of the add-on (1.1.4).