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British English Dictionary (Marco Pinto)

A fork of Mark Tyndall's add-on, based on David Bartlett's
British Dictionary R1.19 for Firefox, Thunderbird and SeaMonkey.

V3.3.3 has 140 000+ new words and also fixes.

Rated 5 out of 5 stars (83)
167,678 users

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English United States Dictionary

English United States (en-US) Dictionary as shipped with Thunderbird 115 ESR and Firefox 115 ESR.

Rated 4 out of 5 stars (39)
67,653 users

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French spelling dictionary

Spelling dictionary for the French language.

Rated 4 out of 5 stars (53)
108,358 users

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Deutsches Wörterbuch

Deutsches Wörterbuch (neue Rechtschreibung) für die Rechtschreibprüfung in Mozilla-Produkten

Rated 4 out of 5 stars (82)
231,487 users

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Diccionario de Español/España

Diccionario de Español/España

Rated 4 out of 5 stars (167)
60,584 users

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Manually sort folders

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 (619)
15,155 users

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gContactSync Requires Restart

Synchronizes contacts & groups between Thunderbird and Google Contacts.

Rated 4 out of 5 stars (416)
15,668 users

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Brazilian Portuguese Dictionary (New Spelling)

The same spellchecker shipped with the Brazilian version of Firefox.

Rated 4 out of 5 stars (46)
7,448 users

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Wörterbuch Deutsch (de_DE)

Deutsches Wörterbuch igerman98 (de_DE, Deutschland, "neue" Rechtschreibung), für Firefox, Thunderbird und Seamonkey.

Rated 4 out of 5 stars (24)
38,842 users

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Dizionario italiano

Add support for Italian to spellchecking

Rated 4 out of 5 stars (71)
74,223 users

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Polski slownik poprawnej pisowni

Polski słownik poprawnej pisowni dla Firefoksa, Thunderbirda i SeaMonkey.

Rated 5 out of 5 stars (50)
48,725 users

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Woordenboek Nederlands

Woordenboek Nederlands met de woordenlijst van OpenTaal.

Rated 3 out of 5 stars (70)
23,108 users

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Русский словарь проверки орфографии

Русский словарь проверки орфографии

Rated 4 out of 5 stars (136)
12,461 users

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Verificador Ortográfico para Português do Brasil

Possui a maioria das palavras existentes em português do Brasil, de acordo com o novo acordo ortográfico que entrou em vigor janeiro de 2009. É Atualizado constantemente.

Precisa de ajuda?
facebook.com/RescueLanguage
rescuelanguage.sf.net

Rated 5 out of 5 stars (75)
5,916 users

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Mail Redirect Requires Restart

Allow to redirect (a.k.a. "remail") mail messages to other recipients.

Rated 4 out of 5 stars (144)
2,724 users

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Diccionario español México

Diccionario para México.

Rated 4 out of 5 stars (92)
8,195 users

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English (Australian) Dictionary

Australian English Dictionary for Mozilla applications.

Rated 4 out of 5 stars (126)
9,383 users

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CompactHeader Requires Restart

Add symbol in header plane to switch between compact and expanded view. Work only for Thunderbird 68.0 and older. Currently, there are no plans to update this for newer versions.

Rated 5 out of 5 stars (191)
16,380 users

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Greek spellchecking dictionary

Ο επίσημος Ελληνικός ορθογραφικός έλεγχος για όλες τις εφαρμογές της οικογένειας του Mozilla (Firefox- Thunderbird- Seamonkey)

Rated 4 out of 5 stars (84)
7,717 users

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Corretor para Português de Portugal

Corretor ortográfico para Português de Portugal (pt-PT)

Rated 4 out of 5 stars (95)
8,341 users

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