I second the idea of composing new messages in Thunderbird in a new tab instead of a new window.I don't like multiple windows in general, it clutters the desktop space, and the fact that everything works with tabs in Thunderbird, or is at least able ...
I second this suggestion.It is especially useful when not using the reading pane, in which case, clicking an email once does nothing apart from highlighting the email. Which isn't very useful.In fact, I don't think it makes sense to add this function...