Rated 4 out of 5 stars

by Tomoya Asai on Feb. 5, 2012 ·

Good extension.
If this extension can keep "References" and "In-Reply-To" headers too, it's better since thunderbird use them to find thread of the mail.

This review is for a previous version of the add-on (0.1.6). 

by Egor Potiomkin (Developer) on March 5, 2012 ·

Tomoya Asai, thank you for review! This option is added to 0.1.7 version.