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Hide Email Folders

Hide Email Folders from the Folder pane (Left pane).
Note: This addon only works for Unified pane/folder mode.
Note #2: Please note that this addon only hide email folders and NOT local folders!
Special thanks to John Bieling, C-E and Alex Cabal.

Rated 4 out of 5 stars (9)
269 users

OpenFolder

This add-on makes it easy to open folders on a file server.

In order to use the add-on, you need to install two things: the add-on and the linked app.
You can download the linked app from the following website.

https://openfolder.net/

Rated 3 out of 5 stars (2)
191 users

Full Address Column

Adds a full sender and recipient e-mail column to message list panel.

Rated 5 out of 5 stars (71)
5,330 users

Auto-Mark Folder Read

New messages can be automatically marked as read in common folders (e.g. spam, trash, drafts, templates).

Rated 4 out of 5 stars (11)
654 users

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.

Rated 3 out of 5 stars (19)
1,026 users

Move Folder (context-menu)

Adds the "Move to" menu entry to the folders panel context menu, allowing to move a Local folder (and its content) to another.
This feature is similar to the native one within message(s) context menu ("Move To"), but it applies to the folder tree.

Rated 3 out of 5 stars (2)
418 users

Move Mail Shortcuts

Allows assigning keyboard shortcuts for moving mails to folders and jumping to the folders.

Rated 4 out of 5 stars (12)
521 users

Open in browser

A context menu item to open the links associated with feed items in the default browser and then mark them as read.

Rated 5 out of 5 stars (1)
291 users

Archive old messages

A context menu item to archive all messages than older than a given duration.

Not yet rated
378 users

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Context menu on message allowing quick filtering based on email/sender or domain

Rated 5 out of 5 stars (7)
1,173 users

Send then Archive

Automates the process of archiving a message that has been replied to.

Rated 3 out of 5 stars (4)
37 users

Filter Manager

Adds a Filters Button, opens Filter Manager

Rated 5 out of 5 stars (5)
1,802 users