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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.

V3.3.6 has 140 000+ new words and also fixes.

Rated 5 out of 5 stars (83)
152,767 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)
60,393 users

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German Dictionary

German Dictionary (new Orthography) for spellchecking in Mozilla products

Rated 4 out of 5 stars (83)
230,824 users

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Spanish (Spain) Dictionary

Spanish/Spain Dictionary

Rated 4 out of 5 stars (167)
52,071 users

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Dizionario italiano

Add support for Italian to spellchecking

Rated 4 out of 5 stars (71)
68,447 users

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Woordenboek Nederlands

Dutch dictionary with wordslist from OpenTaal.

Rated 3 out of 5 stars (70)
23,172 users

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Diccionario español Argentina

Spanish dictionary for Argentina.

Rated 4 out of 5 stars (93)
11,788 users

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Ukrainian dictionary

Ukrainian (uk-UA) spellchecking dictionary

Rated 5 out of 5 stars (58)
8,798 users

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General Catalan dictionary

Free Catalan (general version) spelling dictionary.

Rated 4 out of 5 stars (40)
11,217 users

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Canadian English Dictionary

For some reason, Mozilla doesn't have a Canadian localization team, but I know that even the British dictionary doesn't quite cut it for the truly patriotic.

Rated 4 out of 5 stars (82)
8,855 users

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German Dictionary, classical spelling standards

German Dictionary according to the classical spelling standards for spell-checking in Firefox and Thunderbird

Rated 5 out of 5 stars (20)
8,968 users

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Hungarian Dictionary

This extension is based on László Németh's Hungarian Dictionary

Rated 4 out of 5 stars (56)
7,947 users

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Český slovník pro kontrolu pravopisu

Slovník pro kontrolu pravopisu pro aplikace Mozilla

Rated 4 out of 5 stars (36)
13,148 users

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German Dictionary, extended for Austria

German dictionary (new Orthography) for spellchecking in Mozilla products, extended with Austrian words

Rated 5 out of 5 stars (22)
4,988 users

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German Dictionary (Switzerland)

Dictionary with Swiss variants of German words for spellchecking in Mozilla products

Rated 5 out of 5 stars (3)
12,963 users

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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)
562 users

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Český slovník kontroly pravopisu (bez diakritiky)

Slovník pro kontrolu pravopisu u textů bez diakritiky pro aplikace Mozilla

Rated 4 out of 5 stars (8)
2,093 users

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Slovak spell checking dictionary

Slovak spell checking dictionary for Mozilla applications (based on the "open-source" dictionaries by Zdenko Podobný).

Rated 4 out of 5 stars (6)
2,717 users

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Valencian Catalan dictionary

Free Catalan (Valencian version) spelling dictionary.

Rated 4 out of 5 stars (32)
644 users

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Corrector de Galego

Corrector ortográfico de galego baseado na Normativa da RAG do 2003.
Conten a versión comunidade.
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Galician spellchecking dictionary based on the 2003 RAG Standard.
This extension contains the version comunidade.

Rated 5 out of 5 stars (7)
1,111 users

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