Up & Coming Extensions

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Correct Identity

Ever sent mail from the wrong email address because you forgot to select the correct identity?

Rated 4 out of 5 stars (108)
830 users

Copy Folder mod Requires Restart

I corresponded to thunderbird 60 or later
Copy Folder

original:
https://addons.thunderbird.net/ja/thunderbird/addon/copy-folder/

Rated 4 out of 5 stars (8)
1,181 users

Auto Compress File Requires Restart

Compressor for attachment files. All platforms are supported (Windows, Linux and Macintosh).

Rated 5 out of 5 stars (18)
1,847 users

Copy Folder Requires Restart

The missing Thunderbird "copy folder" feature! Copy folders or entire POP/IMAP accounts recursively to any location while maintaining folder structure.

Rated 2 out of 5 stars (75)
952 users

ThunderPEC Requires Restart

ThunderPEC semplifica la gestione della Posta Elettronica Certificata (PEC) e delle comunicazioni PCT e FatturaPA in Thunderbird.

Rated 4 out of 5 stars (35)
989 users

Display Quota Requires Restart

This extension will display the current status of your IMAP quota in thunderbird's statusbar and will warn you when you reach a configurable limit...

Rated 4 out of 5 stars (51)
8,813 users

FileLink provider for Send

Securely encrypt and upload large attachments to any Send service instance (formerly Firefox Send).

Rated 5 out of 5 stars (1)
6,833 users

IMAP Quota (Free Space) Requires Restart

This Thunderbird addon lets you customize the IMAP quota statusbar panel.

Rated 4 out of 5 stars (13)
2,992 users

Stationery Requires Restart

Extension to mimic Outlook Express Stationery.
Allow you to use HTML files as templates for mail. Also allow custom template in replies or forwarded mail!

Rated 4 out of 5 stars (166)
2,309 users

Outlook/Teams Appointments

Get the hidden appointment from an email from outlook/teams as a .ics-file - Icon: https://fontawesome.com/

Rated 4 out of 5 stars (4)
1,957 users

LookOut (fix version)

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

Rated 4 out of 5 stars (78)
159,544 users

Attachment Extractor

Extract attachments from selected e-mails!

Instructions:
1. Select one or more messages
2. Right click and choose Attachment Extractor
3. Select a template for filenames and target folder
4. Choose to either delete attachments or not
5. Done

Rated 3 out of 5 stars (15)
1,467 users

Auto Password Registerer Requires Restart

Registers given passwords to Firefox/Thunderbird's password manager automatically.

Rated 5 out of 5 stars (2)
1,925 users

globalChrome.css Requires Restart

Provides global user stylesheet.

Not yet rated
1,929 users

Custom Address Sidebar Requires Restart

Allow you to help address sidebar more useful.

Rated 5 out of 5 stars (22)
2,939 users

Set Default Columns Requires Restart

Provides ability to set default visibility of columns in the thread pane.

Rated 4 out of 5 stars (3)
1,949 users

Addressbooks Synchronizer

Synchronizes selected addressbooks with other instances of thunderbird
using local files, webdav servers or imap servers

Rated 4 out of 5 stars (73)
26,413 users

Grammar and Spell Checker — LanguageTool

Check your emails for spelling and grammar issues

Rated 4 out of 5 stars (14)
10,876 users

ReplyWithHeader

Outlook style headers and few goodies for Thunderbird.

Rated 5 out of 5 stars (59)
9,800 users

LookOut 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).

Rated 4 out of 5 stars (157)
2,939 users