Review for Disable DragAndDrop (Thunderbird) by Caleb Murdock
Rated 5 out of 5 stars
I have been using Thunderbird for less than a week and ALREADY I have moved around folders by accident. Thank God someone made this add-on!
To answer what someone said in another review, if you DO want to move a folder, all you would need to do is to temporarily disable this add-on in the Tools menu. (If I am wrong, please let me know.)
To create your own collections, you must have a Mozilla Add-ons account.