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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.

Rated 5 out of 5 stars (1)
22,361 users
Updated May 19, 2024

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.

Rated 5 out of 5 stars (49)
3,729 users
Updated May 17, 2024

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.

Rated 5 out of 5 stars (83)
171,393 users
Updated May 1, 2024

CT Cornish Spell-Checker - SWF

This is a spell-checker for the Cornish language in the Standard Written Form.

Not yet rated
3 users
Updated Dec. 22, 2023

Spanish (Mexico) Dictionary

Spanish (Mexico) spell checker dictionary

Rated 5 out of 5 stars (1)
8,087 users
Updated Oct. 1, 2023

Spanish (Spain) Dictionary

Spanish/Spain Dictionary

Rated 4 out of 5 stars (167)
65,403 users
Updated Aug. 26, 2023

German Dictionary

German Dictionary (new Orthography) for spellchecking in Mozilla products

Rated 4 out of 5 stars (82)
225,402 users
Updated Dec. 4, 2022

smartCompose

A smart Plugin which provides functionalities to compose emails.

Not yet rated
11 users
Updated Sept. 28, 2022

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)
9,693 users
Updated Aug. 3, 2021

Woordenboek Nederlands

Dutch dictionary with wordslist from OpenTaal.

Rated 3 out of 5 stars (70)
22,732 users
Updated May 17, 2021

Grammalecte [fr] (for Thunderbird)

French grammar checker. Included: conjugation tool, text formatter and spelling dictionaries.

Rated 4 out of 5 stars (16)
5,836 users
Updated Feb. 22, 2021

Dizionario italiano

Add support for Italian to spellchecking

Rated 4 out of 5 stars (71)
78,231 users
Updated Dec. 13, 2020

Hungarian Dictionary

This extension is based on László Németh's Hungarian Dictionary

Rated 4 out of 5 stars (56)
9,438 users
Updated Nov. 23, 2019

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)
9,312 users
Updated Oct. 4, 2019

Ukrainian dictionary

Ukrainian (uk-UA) spellchecking dictionary

Rated 5 out of 5 stars (57)
12,048 users
Updated July 21, 2019

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.

Rated 4 out of 5 stars (11)
436 users
Updated March 19, 2019

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

Rated 5 out of 5 stars (1)
13 users
Updated March 19, 2019

Eʋegbe Spelling Dictionary

Eʋegbe Spelling Dictionary for Firefox 6.*

Rated 4 out of 5 stars (2)
17 users
Updated March 19, 2019

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
Updated March 19, 2019

Marathi Dictionary

This dictionary is based on the Marathi word list provided
http://code.google.com/p/hunspell-marathi-dictionary/

Rated 4 out of 5 stars (7)
29 users
Updated March 19, 2019