Developer reply by Christopher Leidigh
Rated 1 out of 5 stars
Kein Import der mbox Dateien möglich.
Nur Profil Import möglich, das nicht existiert.
Schlechte Anleitung.
ImportExportTools does have mbox import and export capabilities.
If you read the help (localized for all locales), there are descriptions for all of the context menus. Right click on a folder and it will give you these options.
Christopher
To create your own collections, you must have a Mozilla Add-ons account.