Great extension! Rated 5 out of 5 stars

Just what I was looking for. I would only make force_cc default to true (I went to advanced configuration to set it myself). Now my only complaint is that the cursor is not in the To field when composing a new email. You always have to click the To field to enter these fields. Can you fix this?

This review is for a previous version of the add-on (1.0_r116). 

Thanks for your reply.
The 1.0 version fixes the focus. And you can select the field (To, Subject or Content) in preferences.