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Copy Sent to Current Requires Restart

Allows to place a copy of sent messages (aka FCC) into the currently active folder or any other folder you choose, when you create the message. Usually the copies are placed into the 'Sent' folder. For replies, you may also move the original message.

Rated 4 out of 5 stars (70)
2,829 users
Updated May 20, 2019

Show Outlook Appointments (vcal / ics) Requires Restart

An extension to show embedded Outlook calendar (vcal / ics) parts.

Thunderbird doesn't show calendar parts from Outlook appointment emails. This addon adds a button to download the embedded appointment as ICS to import it into another calendar.

Not yet rated
0 users
Updated Jan. 7, 2019

ThunderLink

Clickable, durable links to specific messages inside Thunderbird.

Rated 4 out of 5 stars (18)
564 users
Updated Jan. 7, 2019

EnForward Requires Restart

Save your email into Evernote by forwarding it to Evernote email address.
Before you use it, you need to specify your Evernote email address (see the screenshot).

This function can be invoked by "Forward to Evernote" in the context menu.

Rated 4 out of 5 stars (8)
1,571 users
Updated Jan. 6, 2019

Allow HTML Temp Requires Restart

This Add-on allows to have HTML temporarily allowed in the currently displayed message by only one click. When switching to another message, it'll be shown automatically again in plain text or simple html mode (if this is your default mode).

Rated 4 out of 5 stars (64)
10,557 users
Updated Jan. 6, 2019

Thunderbird Conversations

This addon provides a conversation view for Thunderbird, grouping messages together and allowing you to reply "inline" thus providing a more efficient workflow.

Rated 4 out of 5 stars (434)
24,319 users
Updated Jan. 1, 2019

Windows Taskbar Unread Badge

Put an unread mail count badge on the Thunderbird icon in the Windows taskbar.

Rated 3 out of 5 stars (17)
957 users
Updated Dec. 24, 2018

ReFwdFormatter Requires Restart

Remove the ">" prefix from quote when you make a reply.

[Source code] https://github.com/isshiki/ReFwdFormatter

Rated 3 out of 5 stars (9)
3,086 users
Updated Dec. 24, 2018

Spamness Requires Restart

Visual representation of how spam-like messages are.

Rated 3 out of 5 stars (20)
97 users
Updated Dec. 24, 2018

TitleCase For Thunderbird Requires Restart

Transform strings into Title Case, Proper Case, Start Case, Camel Case, Upper Case, and Lower Case. Highlight your text and only changing what you highlighted.

Rated 4 out of 5 stars (10)
361 users
Updated Dec. 24, 2018

SortPref Requires Restart

Adds the ability to control primary, default sorting and threading options.

Rated 4 out of 5 stars (12)
389 users
Updated Dec. 24, 2018

Manually sort folders Requires Restart

This extension allows you to manually sort (order) your folders in the folder pane of Thunderbird or automatically sort them, but in a better way. This extension also allows you to re-order accounts in the folder pane.

Rated 4 out of 5 stars (300)
166,780 users
Updated Dec. 16, 2018

filemail Requires Restart

Move mails to the same folder where previously mails have been moved from this author by hitting a single key

Rated 3 out of 5 stars (11)
83 users
Updated Dec. 11, 2018

Mark All Read Button Requires Restart

Adds toolbar buttons to Mark All emails as Read, Mark Thread as Read, and Goto Next Unread Thread.

Rated 4 out of 5 stars (37)
2,611 users
Updated Dec. 10, 2018

ConfirmFolderMove Requires Restart

Introduces a preference that allows users to be prompted before moving folders.

Rated 5 out of 5 stars (10)
3,795 users
Updated Dec. 10, 2018

ResetRec Requires Restart

ResetRec allows you to reset the recipient list.

Rated 5 out of 5 stars (6)
479 users
Updated Dec. 10, 2018

Show InOut

Adds two columns to the list of mails. One shows an indicator wether a mail is incoming or outgoing, the other shows the sender or the recipient of the mail respectively...

Rated 5 out of 5 stars (40)
1,670 users
Updated Dec. 5, 2018

QuickFolders (Tabbed Folders) Requires Restart

The "Swiss army knife" of folders. Turn your favorites into tabs - open folders and subfolders, move mails without scrolling around or searching. powerful + easy.

See new mail at a glance after automatic filtering - supports quickFilters addon!

Rated 5 out of 5 stars (125)
20,909 users
Updated Dec. 4, 2018

Quick Folder Move Requires Restart

When filing messages, a search box will show up allowing you to quickly enter the folder name you want to move to.

If no search term is entered, a list of recent folders will show up instead.

Rated 4 out of 5 stars (78)
4,813 users
Updated Dec. 2, 2018

LookOut (fix version) Requires Restart

LookOut is a plugin which allows Thunderbird to interface with Microsoft's mail tools by decoding metadata and attachments encapsulated/embedded in a TNEF encoded attachment (aka winmail.dat).
Support: Thunderbird and SeaMonkey

Rated 4 out of 5 stars (29)
85,334 users
Updated Nov. 29, 2018