The add-ons included in this collection are all ones that are part of the messaging category on Mozilla Labs: https://mozillalabs.com/messaging/
This addon provides a conversation view for Thunderbird, grouping messages together and allowing you to reply "inline" thus providing a more efficient workflow.
The latest version is compatible with Thunderbird 38+ only (see below for details).
Collector's Note Inspired by the Gmail style conversation view this add-on for Thunderbird gives a conversation style view for reading and replying to messages inside the Thunderbird message reader.
Adds a summary of mail accounts and folders to replace the account central pane and the empty folder preview
Collector's Note Summarises folders and accounts with useful information about each.