Assegnate 4 su 5 stelle

This is very good addon, but I have faced with a problem in one particular case:
I have created new search folder in Thunderbird and have included there all messages from "Inbox" and "Sent Items" (Edit->Find->Search Messages->Save As Search Folder, Give it a name, Choose "Inbox" and "Send Items" folders, select "Match all messages", press OK). And ThreadKey works incorrectly in this new folder - no + and dots appeared :-(
Could anybody give and advice how to solve this problem?

Questa recensione riguarda una versione precedente (0.5) del componente aggiuntivo. 

This is Thunderbird bug 379806 which is fixed in Thunderbird 3.0.

https://bugzilla.mozilla.org/show_bug.cgi?id=379806