Developer reply by Tuxman
Rated 4 out of 5 stars
Как настроить папку для сохранения скаченных файлов?
(How to configure a folder to save downloaded files?)
Go to about:config, add the string "extensions.openDownload2.downloadPath" and set it to the folder you wish. :-)
To create your own collections, you must have a Mozilla Add-ons account.