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Textmarker

Highlights selected text when composing emails. Default colour is yellow - other colours are available via Options.
(Works only during writing an e-mail, i.e. only in the compose window.)

Rated 5 out of 5 stars (34)
44,025 users

FrameWhite

FrameWhite version 141.1 was released, Thunderbird never drop down the letter.
Install Theme 1 or more, And then, manage FrameWhite, so that action is allowed.

send this gift to a friend Eunjo.

Rated 4 out of 5 stars (6)
541 users

TaskviewGridLayout

TaksviewGridLayout works in Thunderbird version 78.0~102.*.
If clicking any task after (re)starting Thunderbird, it PERSISTs.

REQUIREMENTS:
1. 1920 x 1080 RESOLUTION
2. 100% MAGNIFICATION

Praise Stephen Kim Sou-hwan.

April 2nd 2023.

Rated 1 out of 5 stars (1)
4 users

Archive 3 Month

Archive messages that are older than 3 months in inbox and sent folder

Not yet rated
36 users

Link Creator

Open selected URIs, URLs, e-mail addresses, telephone numbers and links.

Rated 5 out of 5 stars (1)
1,106 users

Seafile Filelink2

Store attachments on a seafile share.

Rated 5 out of 5 stars (1)
65 users

QNote

Add sticky notes to your emails with this feature-rich, drop-in replacement for the XNote++ extension.

Rated 5 out of 5 stars (65)
6,453 users

RT Archive Emails to Sugar & SuiteCRM

Archive Emails from Thunderbird to a Sugar or SuiteCRM record of your choice with RT Archive Email.
You can archive one or more emails, along with their attachments, to a Contact, Lead, Account, Opportunity, or Project.

Rated 4 out of 5 stars (5)
93 users

Start with Inbox

Selects the latest message in the Inbox after start of Thunderbird.

Rated 4 out of 5 stars (20)
2,071 users

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.

Rated 5 out of 5 stars (7)
540 users

F9 Hides the Folder Pane

Press F9, or your favourite shortcut, to toggle the visibility of the Folder Pane

Rated 5 out of 5 stars (1)
30 users

Reply with Attachments

Automatically include attachments in email replies.
Skips SMIME certificates to avoid unnecessary attachments

Fügt automatisch Anhänge aus der ursprünglichen E-Mail hinzu.
Überspringt SMIME-Zertifikate, um unnötige Anhänge zu vermeiden.

Rated 5 out of 5 stars (1)
9 users

Thunderbird Send

[IMPORTANT] This is a pre-release version Thunderbird Send. We will gradually open it for beta testing.
This add-on is built and maintained by your friends at Thunderbird.
Stay tuned to updates on thunderbird.net

Not yet rated
7 users

Close Search Tabs

Add a button to close all search results tabs in Thunderbird

Rated 1 out of 5 stars (1)
60 users

Whatsapp - Quick Access

Quick Access to Whatsapp Web in a new tab with just one click on a simple, stylish icon button on your Spaces toolbar.

Rated 5 out of 5 stars (2)
748 users

Skiff Mail - Quick Access

Quick Access to Skiff Mail in a new tab with just one click on a simple, stylish icon button on your Spaces toolbar.

Not yet rated
3 users

Tuta Mail - Quick Access

Quick Access to TutaMail aka Tutanota in a new tab with just one click on a simple, stylish icon button on your Spaces toolbar.

Not yet rated
235 users

Mark Button

Toolbar button to mark a message as read or unread with 1 click.

Rated 5 out of 5 stars (6)
231 users

Google Chat Tab

Open Google Chat in a Thunderbird Tab.

Update: 3 Dec 2024 -
Literally all this extension does is to open Google Chat in a separate tab. Thank you for all your kind comments! I made this to scratch an itch and I'm glad it has helped so many :)

Rated 4 out of 5 stars (11)
1,775 users

update-test

DO NOT install, this is for testing the update mechanism.

If you are interested in the functionality, use quicker quicksearch instead

Rated 3 out of 5 stars (1)
4 users