Developer reply by Jonathan Protzenko
Rated 5 out of 5 stars
This one does NOT replace FolderPane Tools (https://addons.mozilla.org/en-US/thunderbird/addon/258), as this one does NOT sort newsgroup (and mail) accounts. It only sorts things inside an account. It's still a useful tool.
This review is for a previous version of the add-on (0.4.1).Actually, event though it might not replace FolderPane tools completely (which wasn't the goal of this add-on anyway), it DOES sort accounts. Look at the sentence in bold in the add-on description, and look at the first tab of the "Manually sort folders" dialog :).
To create your own collections, you must have a Mozilla Add-ons account.