Thunderbird Fcc extension

Finally I found a Thunderbird extension that allows me to select the Fcc folder on the compose/reply panel.
Not only can you control which folder the mail (once sent) should be filed into, but also

• not to save it at all (no fcc)
• on a reply to also move the original email to the same folder

The latter option simply shows that whoever wrote this extension, knows what (s)he is doing. This is just awesome.