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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.
V3.3.6 has 140 000+ new words and also fixes.
English (Australian) Dictionary
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".
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.
United States English Spellchecker
This dictionary is no longer maintained. Use this dictionary instead.
dictCheck
Requires Restart
dictCheck - Double click on any english word in a page to get the polish meaning. Uses fast online dictionary.
Simple and easy! Enjoy!
English-Russian 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.
US English Medical Dictionary
Requires Restart
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.
Simple English Dictionary
Requires Restart
A Simple English spellchecker for the simple.wikipedia.org
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.
Ogden's Basic English Dictionary for Media
Requires Restart
A spell checker for Ogden's Basic English.
Simpler English DictionaryTo create your own collections, you must have a Mozilla Add-ons account.
