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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)
8,546 users

Deutsches Wörterbuch (de-DE), alte Rechtschreibung

Wörterbuch deutsch (alte Rechtschreibung) für die Rechtschreibprüfung in Firefox und Thunderbird + alte Rechtschreibung + bisherige Rechtschreibung + klassische Rechtschreibung + bewährte Rechtschreibung + unreformierte Qualitätsrechtschreibung +

Rated 5 out of 5 stars (20)
9,666 users

United States English Spellchecker

This dictionary is no longer maintained. Use this dictionary instead.

Rated 4 out of 5 stars (207)
5,291 users

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).

Rated 4 out of 5 stars (6)
805 users

Deutsches Wörterbuch, klassisch und reformiert

Deutsches Wörterbuch nach den bewährten oder reformierten Regeln für die Rechtschreibprüfung in Firefox und Thunderbird
+ klassische Rechtschreibung + alte Rechtschreibung + neue Rechtschreibung + aktuelle Rechtschreibung

Rated 5 out of 5 stars (7)
2,381 users

Slovenské slovní­ky na kontrolu preklepov

Umožňuje kontrolu preklepov (spellcheck) v programoch od Mozilly. Založené na slovníkoch projektu http://sk-spell.sk.cx/. Verzia bez diakritiky je na https://addons.thunderbird.net/en-US/thunderbird/addon/sk-spell-ascii/

Rated 4 out of 5 stars (6)
3,398 users

Finnish Spellchecker

Finnish (fi-FI) spellchecker dictionary for Firefox, Thunderbird and SeaMonkey .

Rated 3 out of 5 stars (9)
381 users

Русский словарь для проверки правописания (Ё)(АОТ)

Русский орфографический словарь. Основан на работе группы AOT.ru.
Версия словаря "только с ё"

Rated 5 out of 5 stars (4)
111 users

Correutor ortográficu d'asturianu

Asturian spellchecking dictionary

Rated 4 out of 5 stars (7)
38 users

Scottish Gaelic spell checker

An open (traditional spellings and GOC inclusive) spell-checking addon for Scots Gaelic, which will correct over 1.7 million words, making it the biggest spell-checking dictionary to date.

Rated 5 out of 5 stars (2)
54 users

Kurdish Sorani Spellchecker

Kurdish Sorani Spellchecker for Firefox, Thunderbird and SeaMonkey by Dr Yadgar Balaky and Ranjbar Balisane.
To enable, right-click in a multi-line text box, select "Languages", then "ku-CKB".

Not yet rated
1 user

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).

Rated 5 out of 5 stars (4)
10 users

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.

Rated 5 out of 5 stars (1)
24,167 users

Tagalog/Filipino Dictionary

A Tagalog/Filipino Dictionary (tl) for Pale Moon, Firefox, Thunderbird, and SeaMonkey.

Not yet rated
1 user

Azerbaijani Spellchecker

Azerbaijani SpellChecker for Mozilla Firefox. Developed with love by Mozilla Azerbaijan.

Not yet rated
2 users