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I have latest version (as of this date) of Thunderbird (91.9.0) 64-bit. This extension is one of the most important add-ons and still works great with this version!

This add-on can ask you what folder to save/move your current email (the one you just finished typing) to when you press send. User interface is perfect. Thanks to Günter Gersdorf for creating and continuing it!

Question:

Has anyone figured out how to configure the Favorites sub-menu yet?

I see that when you are writing a new message, and you click on the Thunderbird drop down menu 'Message', you can select 'Move To' or 'Copy To', and you can see the Recent and Favorites there, also.

I would like to set Recent Items to last longer, and to be able to customize Favorites.

Thanks again!

Edit: I just saw that you have maintained this since 2006, with latest (as of now) update 24.4.2022 with ver 3.15! Legend!!!
I actually have been using it for most of that time.
https://www.ggbs.de/extensions/CopySent2Current.html

Edit 2: (I guess I can't reply to your reply, so I have to put my reply here.) That was easy! It would also be nice to be able to 'cancel' sending an email from your add-on's UI, as well. Thanks so much!

Questa recensione riguarda una versione precedente (3.15) del componente aggiuntivo. 

Just rightclick on a folder in the folderlist and select 'Favorite Folder'