Rated 5 out of 5 stars

Must have plugin. Very useful for me.

PS: Load last version (1.3).

This review is for a previous version of the add-on (1.0.2). 

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). 

Hi,
Problem fixed with 1.0.3 update: https://addons.mozilla.org/fr/thunderbird/addon/edit-email-subject/versions/