Review for Disable DragAndDrop (Thunderbird) by Ronny Adsetts
Rated 5 out of 5 stars
Thanks for this extension, works perfectly. It's a good workaround for the accidental drag/drop of folders trashing saved searches.
For reference, bug for the problem with saved searches is:
https://bugzilla.mozilla.org/show_bug.cgi?id=376007
To create your own collections, you must have a Mozilla Add-ons account.