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Arabic spell-checking dictionary
Arabic spell-checking dictionary for Firefox 3 and Thunderbird 3 from Ayaspell.
Armenian spell checker dictionary
Automatic Dictionary
Remembers the language you use with a person or group of people, and switches the spellchecker language automatically for you next time. You do not have to do it manually any more. It remembers and switches it for you.
Azerbaijani Spellchecker
Azerbaijani SpellChecker for Mozilla Firefox. Developed with love by Mozilla Azerbaijan.
Babylon Dictionary Word Search
Requires Restart
Find the definition for a selected word in a web page or an email.
Right click over the selected word, choose the option "Search in Babylon" and that's it! You will have a new window with the definition of the selected word.
Belarusian spellchecking dictionary (Taraškievica orthography)
Requires Restart
Belarusian spellchecking dictionary (Taraškievica orthography)
Беларускі слоўнік праверкі артаграфіі (клясычны правапіс)
Brazilian Portuguese Dictionary (Former Spelling)
The same spellchecker shipped with the Brazilian version of Firefox, just using the former spelling (which is valid until January 1st 2016).
Brazilian Portuguese Dictionary (New Spelling)
The same spellchecker shipped with the Brazilian version of Firefox.
British English Dictionary
British English Dictionary R1.19 for Firefox, Thunderbird and SeaMonkey by David Bartlett.
To enable, right-click in a multi-line text box, select "Languages", then "English / United Kingdom".
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.
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.
CT Cornish Spell-Checker - SWF
This is a spell-checker for the Cornish language in the Standard Written Form.
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.
CantoFish
Requires Restart
CantoFish is a popup Cantonese-English dictionary for Firefox. It contains over 200,000 entries and works with both traditional and simplified Chinese characters. The Yale and Jyutping romanization systems are supported, as well as Mandarin pinyin.
Church Slavonic Spelling Dictionary
The spelling dictionary is based on the Hunspell spelling dictionary for Church Slavonic (Church Slavic). Numerals only from 1 to 9999 are recognized.
Correcteur Occitan-Languedocien
Correcteur orthographique Occitan Languedocien
Corregidor ortografic Occitan lengadocian
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