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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.

Rated 5 out of 5 stars (83)
152,670 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)
58,908 users

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French spelling dictionary

Spelling dictionary for the French language.

Rated 4 out of 5 stars (53)
104,434 users

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German Dictionary

German Dictionary (new Orthography) for spellchecking in Mozilla products

Rated 4 out of 5 stars (83)
243,622 users

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Spanish (Spain) Dictionary

Spanish/Spain Dictionary

Rated 4 out of 5 stars (167)
49,330 users

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CardBook Featured

A new Thunderbird address book based on the CardDAV and vCard standards.

Twitter: @CardBookAddon

Rated 4 out of 5 stars (492)
63,383 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)
8,102 users

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Mail Merge

Create and Save or Send Multiple Individual and Personalized Messages from a Draft

Rated 5 out of 5 stars (236)
71,771 users

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DKIM Verifier Featured

Verifies the DKIM-Signature of an e-mail.

Rated 4 out of 5 stars (53)
25,667 users

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German dictionary (de_DE)

German dictionary igerman98 (de_DE, Germany), for Firefox, Thunderbird und Seamonkey.

Rated 4 out of 5 stars (24)
38,338 users

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Dizionario italiano

Add support for Italian to spellchecking

Rated 4 out of 5 stars (71)
66,184 users

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Polish Spellchecker Dictionary

Polish spell-check dictionary for Firefox, Thunderbird and SeaMonkey.

Rated 5 out of 5 stars (50)
44,747 users

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Woordenboek Nederlands

Dutch dictionary with wordslist from OpenTaal.

Rated 3 out of 5 stars (70)
22,940 users

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Russian spellchecking dictionary

Russian spellchecking dictionary

Rated 4 out of 5 stars (136)
16,093 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 (76)
6,264 users

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Diccionario español México

Diccionario para México.

Rated 4 out of 5 stars (92)
8,267 users

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English (Australian) Dictionary

Australian English Dictionary for Mozilla applications.

Rated 4 out of 5 stars (126)
8,788 users

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Thunderbird Conversations Featured

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 (579)
24,408 users

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Signature Switch

Switch the signature on/off or choose a new one from your predefined set.

Rated 4 out of 5 stars (310)
54,031 users

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Greek spellchecking dictionary

Greek spellchecking dictionary Mozilla (Firefox- Thunderbird- Seamonkey)

Rated 4 out of 5 stars (84)
6,605 users

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