Rated 4 out of 5 stars

Mostly works for me but unfortunately falls at the first hurdle. I have seven accounts. If I select any of six of them as my default account, composing a new message or replying selects the default. But if I set the seventh account, the one that I really want, as default, NoComposeAccount fails to nominate this as the sending account and uses the account related to the folder I happen to be in,.So I'm currently working with it set to nominate no account and make this a manual selection to see whether nominating a From account manually each time is overall less hassle than occasionally selecting the wrong account.

This review is for a previous version of the add-on (1.1). 

If you'd like me to take a look at it please send me an email.
With a little more info (account settings and maybe Error Console messages) I'm sure we can figure this out.

*edit* I'm guessing this issue was related you having more than one identity configured on the account in question(?) If so, the issue should be fixed as of version 1.3