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Brazilian Portuguese Dictionary (Former Spelling)

The same spellchecker shipped with the Brazilian version of Firefox, just using the former spelling (which is valid until January 1st 2016).

Rated 4 out of 5 stars (6)
749 users

AddressBook in Tab Requires Restart

Adds a button that can be put in toolbars which opens the addressbook in a new tab like pastismans AddressBookTab

Rated 4 out of 5 stars (20)
129 users

Romanian spellchecking dictionary

Romanian spellchecking dictionary for Firefox.

Rated 4 out of 5 stars (40)
4,442 users

Nuvola TB Requires Restart

Theme based on the Nuvola icon set by David Vignoni (http://icon-king.com/?p=15).

You can find developer versions under http://mozilla.paenglab.ch/

Rated 5 out of 5 stars (69)
139 users

Markdown Here Requires Restart

Write your email in Markdown, then make it pretty.

Rated 4 out of 5 stars (46)
35 users

Türkçe Yazım Denetimi

Türkçe Yazım Denetimi
Turkish Spellchecker

Rated 5 out of 5 stars (39)
2,052 users

Emoji Menu Requires Restart

Adds the ability to easily insert emojis into your composed messages in Thunderbird.

Rated 4 out of 5 stars (16)
1,131 users

German dictionary (de_AT)

German dictionary igerman98 (de_AT, Austria), for Firefox, Thunderbird und Seamonkey.

Rated 5 out of 5 stars (5)
3,378 users

Walnut for Thunderbird Requires Restart

Walnut for Thunderbird, based on icons from art.gnome.org, and sporting a wooden look.
Supports Thunderbird versions 53.0 to 60.0. From version 61.0, Thunderbird will drop support for full custom themes.

Rated 5 out of 5 stars (41)
33 users

Contact Photos Requires Restart

Displays contact photos in the message header.

Rated 4 out of 5 stars (31)
91 users

tb_email_grabber Requires Restart

Very basic extension that exports all sender of mails in one folder into a CSV, which includes their fullname and email. The extension adds an option to the folder view context menu. Please select the folder to export before starting the export.

Rated 3 out of 5 stars (5)
6 users

Croatian Dictionary (Hrvatski Rječnik)

Croatian Dictionary (Hrvatski Rječnik) for Mozilla Firefox, Thunderbird and SeaMonkey

Rated 5 out of 5 stars (9)
4,624 users

Lithuanian spelling check dictionary

Lithuanian spellchecking dictionary for Mozilla applications. Included by default in Lithuanian localized versions of Mozilla software.

Rated 5 out of 5 stars (5)
3,251 users

Black Oyster Requires Restart

A clean theme for Thunderbird with dark icons on a light background.

Rated 5 out of 5 stars (10)
1 user

Nautipolis for Thunderbird Requires Restart

Nautipolis for Thunderbird: High-quality, solid theme based on icons from art.gnome.org.
Supports Thunderbird versions 53.0 to 60.0. From version 61.0, Thunderbird will drop support for full custom themes.

Rated 5 out of 5 stars (26)
29 users

Bulgarian Dictionary

Bulgarian spellchecking...

Rated 5 out of 5 stars (30)
4,811 users

Spanish (Venezuela) spell check dictionary

Diccionario en español para Venezuela.
- Corrector Ortográfico (Spell Checker)
- Tesauro de Sinónimos (Thesaurus)
- Separación Silábica (Hyphenation)

¡Hecho en Venezuela!

Rated 5 out of 5 stars (30)
8,077 users

AdvancedTasks Requires Restart

Thunderbirds Lightning Extension: Allows the use of Markdown in Task descriptions and renders them as HTML in the TaskView.

Rated 4 out of 5 stars (9)
12 users

Classic Password Editor Requires Restart

Adds the ability to create and edit entries in the password manager.

Rated 4 out of 5 stars (10)
72 users

Afrikaans spell checker

Afrikaans spell checker for Mozilla Firefox and Thunderbird

Rated 4 out of 5 stars (23)
1,581 users