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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.

V3.3.2 has 140 000+ new words and also fixes.

Rated 5 out of 5 stars (83)
166,300 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)
21,928 users

English (Australian) Dictionary

Australian English Dictionary for Mozilla applications.

Rated 4 out of 5 stars (126)
9,520 users

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)
9,292 users

United States English Spellchecker

This dictionary is no longer maintained.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

Rated 4 out of 5 stars (207)
5,078 users

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".

Rated 3 out of 5 stars (413)
2,374 users

English-Russian dictionary

Spelling of English and Russian words

Rated 4 out of 5 stars (22)
2,304 users

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)
411 users

Multilingual Dictionary

Multilingual Spellchecker - Dictionary

Rated 3 out of 5 stars (2)
4 users

Ogden's Basic English Dictionary for Media Requires Restart

A spell checker for Ogden's Basic English.

Rated 5 out of 5 stars (1)
1 user

Simpler English Dictionary Requires Restart

A Simpler English Spellchecker.

Not yet rated
1 user

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.

Rated 1 out of 5 stars (2)
1 user

Translate English to Czech

Translate english to czech with google translate service.

Rated 5 out of 5 stars (1)
20 weekly downloads

Translate English to Irish

Translate english to irish with google translate service.

Not yet rated
5 weekly downloads

Translate Arabic to English

Translate arabic to english with google translate service.

Rated 4 out of 5 stars (2)
10 weekly downloads

Google PL-EN-PL

Search in English-language-based pages using Polish language

Not yet rated
18 weekly downloads

Translate German to English

Translate german to english with google translate service.

Rated 4 out of 5 stars (2)
27 weekly downloads

English - Estonian

English > Estonian translation with aare.pri.ee online dictionary.

Rated 5 out of 5 stars (1)
1 weekly download

Translate Filipino to English

Translate filipino to english with google translate service.

Not yet rated
4 weekly downloads

Translate Estonian to English

Translate estonian to english with google translate service.

Not yet rated
12 weekly downloads