Rated 3 out of 5 stars

Super unimpressed that I went to send an email and mailmerge intercepted that and sent a recipients warning message. Not sure when this change occurred but didn't experience this "feature" until after I upgraded Thunderbird.

This review is for a previous version of the add-on (9.6.1). 

The "Recipients Reminder" and the "Variables Reminder" can be activated and deactivated in the Preferences in the Add-ons Manager.