Folders and Filters
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Archive 3 Month
Archive messages that are older than 3 months in inbox and sent folder
Message Mover
This add-on lets you move messages from a specific folder (and sub-folders) to a new folder.
DetachAttachment - Attachment clipper, Extractor Requires Restart
This addon provides functionality of bulk delete attachments of selected messages.
Delete-command is added to the messages' context menu.
Group Favorite Folders
An extension for Thunderbird 115+ (Supernova) that groups and sorts favorites folders in the compact view.
Send then Archive
Automates the process of archiving a message that has been replied to.
Mark All Read:WE
Mark all read (Web extension) - Adds a toolbar button to mark all unread messages in current folder as read.
*Note*
This addon works much better in newer versions of Thunderbird (v91). Thunderbird's WebAPI's were very patchy in older versions.
Archive old messages
A context menu item to archive all messages than older than a given duration.
Copy Folder mod Requires Restart
I corresponded to thunderbird 60 or later
Copy Folder
original:
https://addons.thunderbird.net/ja/thunderbird/addon/copy-folder/
GMail Labels
Shows GMail labels in each message's headers panel. When using Thunderbird with a Gmail account, it is not possible to guess which Gmail labels a message was applied (and in which folders it can be found). This extension provides this information
X-Original-To Column
This addon adds a new column called X-Original-To in the message list which shows the original recipient address of the message (the contents of the X-Original-To header). This can be useful for systems with catch-all email addresses.
AutoBucket
This is an extension function that classifies emails into multiple buckets using AI(the Bayesian filter) and tags them.
Move Mail Shortcuts
Allows assigning keyboard shortcuts for moving mails to folders and jumping to the folders.
YNote Requires Restart
Make some text notable on the each folder in folder's property dialog box.
Start with Inbox
Selects the latest message in the Inbox after start of Thunderbird.
Nostalgy++/ Manage, search and archive emails
Shortcuts to move/copy/archive messages, with folder name completion.
Rules for moving messages to folders.
Automatic rules by statistical observation/ by folder of conversation/thread.
Search dialog in a tab, with message display /folder tree.
RemindMe
Moves email into Inbox/RemindMe folder, and moves it back into Inbox after chosen time.
ShowFolderSize-T Requires Restart
Shows folders size on disk.
This add-on is a fork of ShowFolderSIze.
https://freeshell.de//~kaosmos/index-en.html#foldersize
Custom Subject Column
Add a column to the message list that replaces the subject with a regular expression
Quick Filter By
A simple extension that sets the Quick Filter based on the selected message fields. You can filter by either selecting "Quick Filter By" in the message list context menu or simply by alt-clicking on the message's sender, recipient or subject text.
To create your own collections, you must have a Mozilla Add-ons account.