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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)
148,436 users

Auto Resize Image Requires Restart

Resizer for inline and attachment images (JPEG, PNG, BMP and GIF image formats).
All platforms are supported (Windows, Linux and Macintosh).

Rated 4 out of 5 stars (62)
169 users

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)
54,238 users

French spelling dictionary

Spelling dictionary for the French language.

Rated 4 out of 5 stars (54)
108,684 users

Deutsches Wörterbuch

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

Rated 4 out of 5 stars (83)
248,498 users

Diccionario de Español/España

Diccionario de Español/España

Rated 4 out of 5 stars (167)
52,933 users

Brazilian Portuguese Dictionary (New Spelling)

The same spellchecker shipped with the Brazilian version of Firefox.

Rated 4 out of 5 stars (46)
6,872 users

Wörterbuch Deutsch (de_DE)

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

Rated 4 out of 5 stars (24)
38,529 users

Dizionario italiano

Add support for Italian to spellchecking

Rated 4 out of 5 stars (72)
76,913 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 (158)
693 users

Polski slownik poprawnej pisowni

Polski słownik poprawnej pisowni dla Firefoksa, Thunderbirda i SeaMonkey.

Rated 5 out of 5 stars (50)
34,696 users

Woordenboek Nederlands

Woordenboek Nederlands met de woordenlijst van OpenTaal.

Rated 3 out of 5 stars (70)
22,462 users

Русский словарь проверки орфографии

Русский словарь проверки орфографии

Rated 4 out of 5 stars (136)
13,837 users

QuickNote Requires Restart

A simple note-taking extension.

Rated 5 out of 5 stars (204)
38 users

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)
5,337 users

Mail Redirect Requires Restart

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

Rated 4 out of 5 stars (144)
1,965 users

Diccionario español México

Diccionario para México.

Rated 4 out of 5 stars (92)
5,952 users

English (Australian) Dictionary

Australian English Dictionary for Mozilla applications.

Rated 4 out of 5 stars (126)
8,227 users

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)
6,813 users

Corretor para Português de Portugal

Corretor ortográfico para Português de Portugal (pt-PT)

Rated 4 out of 5 stars (95)
8,019 users