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British-English Dictionary (GB)
A strict British-English spell checker dictionary for Firefox, Thunderbird and SeaMonkey. This dictionary only includes words conforming to the preferred standard of British-English spelling.
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.
V3.3.2 has 140 000+ new words and also fixes.
CT Cornish Spell-Checker - SWF
This is a spell-checker for the Cornish language in the Standard Written Form.
Spanish (Mexico) Dictionary
Spanish (Mexico) spell checker dictionary
German Dictionary
German Dictionary (new Orthography) for spellchecking in Mozilla products
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.
Woordenboek Nederlands
Dutch dictionary with wordslist from OpenTaal.
Hungarian Dictionary
This extension is based on László Németh's Hungarian Dictionary
German Dictionary, classical spelling standards
German Dictionary according to the classical spelling standards for spell-checking in Firefox and Thunderbird
Ukrainian dictionary
Medical Spell Checker with OpenMedSpel
OpenMedSpel for Mozilla Firefox, Thunderbird, and SeaMonkey is free and open source medical spell checking dictionary that includes nearly 50,000 medical terms ranging from abdominis to zygomatic.
Haitian Creole spell checker
Korektè Òtograf Kreyòl (KÒK) se yon korektè òtograf otomatik gratis nan lang Kreyòl Ayisyen ki develope avèk èd LOGIPAM ak Kevin Scannell
Korektè Òtograf Kreyòl (KÒK) is a free Haitian Creole Spell Checker developed by LOGIPAM and Kevin Scannell
Eʋegbe Spelling Dictionary
Eʋegbe Spelling Dictionary for Firefox 6.*
Словникъ Български
This is a Bulgarian spell-checker based on the historic orthography from 1899 known as "Ivanchevski pravopis". It is using the Mozilla built-in spell-checking engine (hunspell).
Marathi Dictionary
This dictionary is based on the Marathi word list provided
http://code.google.com/p/hunspell-marathi-dictionary/
Lower Sorbian dictionary
Spellchecking dictionary for Lower Sorbian language.
Soŋay senni hantum tenjandikaw
Soŋay senni hantum tenjendikaw kaŋ ga goy nda Firefox, Thunderbird nda Seamonkey
Songhay Spellchecker for Firefox, Thunderbird and Seamonkey.
Nepali Dictionary
Nepali SpellChecking dictionary (based on dictionary compiled by Madan Puraskar Pustakalaya)
To create your own collections, you must have a Mozilla Add-ons account.
