Developer reply by Arnd Issler
Rated 4 out of 5 stars
Works quite good with Thunderbird 17.0.5 on Win7 64 Bit. Though it is a bit strange that an e-mail is only being selected but not opened when I click "Nachricht öffnen". Maybe there should another button "Nachricht auswählen".
This review is for a previous version of the add-on (0.7.3).Thanks for your comment. You're right, the behaviour is a litte bit strange, I'm looking forward changing the behaviour or the button caption. :-) Put this issue on my todo list.
To create your own collections, you must have a Mozilla Add-ons account.