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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.

V3.3.3 has 140 000+ new words and also fixes.

Peringkat 5 dari 5 bintang (83)
162.572 pengguna

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.

Peringkat 4 dari 5 bintang (82)
9.178 pengguna

United States English Spellchecker

This dictionary is no longer maintained.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

Peringkat 4 dari 5 bintang (207)
4.943 pengguna

Русский и Английский словари правописания

Правописание Русских и Английских слов

Peringkat 4 dari 5 bintang (22)
1.380 pengguna

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.

Peringkat 4 dari 5 bintang (11)
394 pengguna

Multilingual Dictionary

Multilingual Spellchecker - Dictionary

Peringkat 3 dari 5 bintang (2)
5 pengguna

US English Medical Dictionary Perlu Mulai Ulang

Adds 7,500+ medical terms to the standard US English dictionary. Enabled by right clicking on a textarea, selecting "Languages" then "English (Medical)". For use in Firefox, Thunderbird and SeaMonkey.

Peringkat 1 dari 5 bintang (2)
1 pengguna

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.

Peringkat 5 dari 5 bintang (1)
21.953 pengguna