Rated 5 out of 5 stars

Please Help, doesn't work. When i press mail merge it appears error message "invalid recipient address" and i can't go to the windows where i can choose the .csv file. Last May worked perfectly. Thunderbird v. 78.7.1 (64-bit) and mail merge v. 7.3.1

Found this solution: You must hit "Enter" or "Tab" once you have added the variable(s) in the To field.

This review is for a previous version of the add-on (7.3.1).