Rated 5 out of 5 stars
Must have plugin. Very useful for me.
PS: Load last version (1.3).
Doesn`t support cyrillic letters. Rated 3 out of 5 stars
When I rename letter with cyrillic letters, it renames to garbage.This review is for a previous version of the add-on (1.0.2).
Problem fixed with 1.0.3 update: https://addons.mozilla.org/fr/thunderbird/addon/edit-email-subject/versions/