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ReFwdFormatter

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

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

Rated 4 out of 5 stars (15)
2,072 users

List Addons in Windows' Programs

List addons in Windows' "Add or Remove Programs".

Rated 5 out of 5 stars (1)
9,664 users

TexTra

Thunderbirdのメールのテキストを翻訳、辞書引きを行います。

Rated 4 out of 5 stars (2)
656 users

Hindi Spell Checker

This is a real time spell checker for Hindi, supported on Firefox,
Thunderbird, and Seamonkey.

Not yet rated
164 users

Latin Dictionary

Latin dictionary

Rated 5 out of 5 stars (8)
337 users

LocalFolders

Add as many local folders as you want to.
New folders can reside on mapped or network locations.

Rated 4 out of 5 stars (38)
12,919 users

Correct Identity

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

Rated 4 out of 5 stars (119)
2,187 users

Hebrew spell-checking dictionary (from HSpell)

Hebrew spell-checking dictionary for Firefox and Thunderbird. Generated from data of the HSpell project version 1.4, and distributed freely under the AGPLv3.

Rated 4 out of 5 stars (20)
765 users

Vietnamese Dictionary

Enables spell checking in Vietnamese with a wordlist based on Hồ Ngọc Đức’s Free Vietnamese Dictionary Project.

Rated 5 out of 5 stars (26)
331 users

Diccionario Ortográfico de Español Colombia

Este diccionario no constituye un diccionario de definiciones sino un diccionario destinado para la corrección ortográfica de Español Colombia (es-CO). Colombian spanish (es-CO) spellchecker.

Rated 5 out of 5 stars (4)
577 users

Slovar za slovenski jezik

Spell-checking dictionary for the Slovene language

Rated 5 out of 5 stars (16)
2,785 users

No Message Pane Sort

No Message Pane Sort prevents accidental resorting of the message pane by disabling mouse button clicks on the column headers, thus, locking the sorting order of your emails.

It is still possible to sort messages by ctrl-clicking the header.

Rated 5 out of 5 stars (55)
3,880 users

WarnAttachment

WarnAttachment shows an additional dialog to confirm potentially dangerous attachments. Some attachments like executables etc. are completely blocked. This reduces the risk of malware especially for inexperienced users.

Rated 5 out of 5 stars (12)
2,841 users

Unmangle Microsoft ATP Safelinks

Users of outlook.com and o365 who have Advanced Thread Protection enabled will have all URL's in emails changed to redirect them to an Microsoft filter before opening. This is a bad idea.

This plugin will change the URL back to the original value.

Rated 5 out of 5 stars (6)
734 users

Quick Folder Key Navigation

This extension makes it possible to quickly navigate to a particular folder in the folder pane simply by typing the first few letters of the folder name when the folder pane has focus.

Rated 4 out of 5 stars (15)
893 users

EuropeanMX Spam Reporter

Train your EuropeanMX filter by reporting unrecognized spam back to us.

Rated 3 out of 5 stars (3)
208 users

ThunderStats! Your Thunderbird Statistics!

Do you remember the old good Eudora statistics? Do you miss them?
Using this addon you can finally keep an eye on how you use your beloved Thunderbird!

Rated 4 out of 5 stars (14)
489 users

Greek - English (US) Spelling dictionary

Combined Greek - English (US) spell checking dictionary for Firefox - Thunderbird - Seamonkey

Rated 5 out of 5 stars (11)
621 users

SubSwitch

Simplify email categorization - it will be easier for you and others to manage mail. Define the set of prefixes for all emails you send or let SubSwitch to autodiscover it. While writing insert prefix to the title - choose one from your set.

Rated 4 out of 5 stars (16)
272 users

Paranoia

Check if your emails arrived TLS-encrypted (and which corporations were able to read it nevertheless)

Rated 4 out of 5 stars (16)
728 users