Review for Thunderbird Conversations by FrontSide
Rated 4 out of 5 stars
Very good extension, especially if you like GMail-s conversation style. One minor problem I had is that the quick-reply messages do not show up in the threads. The normal replies do show up, after configuring Thunderbird to copy sent messages to the Inbox. Somehow this does not seem work for quick replies.
This review is for a previous version of the add-on (2.2.2).To create your own collections, you must have a Mozilla Add-ons account.