Assegnate 4 su 5 stelle

Just what I was looking for..... But would like to see a new feature in the next version. Where
we print a message without conversation. i.e. only a copy of the message received or sent should be printed instead of the whole conversation. This would be really helpful. Of course you can achieve this in the current version by selecting the text you want to print but an automatic version would be much better.

Questa recensione riguarda una versione precedente (1.0) del componente aggiuntivo. 

If I've understood well, you're talking about a bug/feature of new versions of TB. See https://bugzilla.mozilla.org/show_bug.cgi?id=680446
Try to put the preference mail.operate_on_msgs_in_collapsed_threads at false, it should solve.
In future versions, I could put this preference in PrintingTools GUI, but I don't know what behaviour TB developers have choosen for future.