Rated 5 out of 5 stars
Hey, I love your Thunderbird add-on.
One thing that I feel could improve it is the ability for a particular template to add text to the subject line of the email. I'm sending a lot of people my contact info, for example, because I ran out of business cards at a recent conference. I'd like a template that could add "Here's my contact info" to the subject line to save me the time of typing it every time. It could be coded to automatically add to the beginning of whatever's already in the subject line, in case you're replying to an email, and the subject line already has the "Re: those aardvarks you asked about" stuff in it.
Anyway, kudos on the great add-on!