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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)

171,612 users

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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)

22,691 users

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English (Australian) Dictionary

Australian English Dictionary for Mozilla applications.

Rated 4 out of 5 stars (126)

9,729 users

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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)

9,492 users

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United States English Spellchecker

This dictionary is no longer maintained.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

Rated 4 out of 5 stars (207)

5,212 users

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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)

2,452 users

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English-Russian dictionary

Spelling of English and Russian words

Rated 4 out of 5 stars (22)

2,378 users

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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)

421 users

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Multilingual Dictionary

Multilingual Spellchecker - Dictionary

Rated 3 out of 5 stars (2)

4 users

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Dict

Looks up the definition of words on a Web page.

Rated 5 out of 5 stars (15)

3 users

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South African English spell checker Requires Restart

The South African English spell checker allows you to use place names, borrowed words, and other expressions that are unique to South Africa.

"No more eina, just a lekker spell checker!"

Rated 5 out of 5 stars (3)

3 users

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PageTweak - Ad Blocker, Video Downloader, Translator...

The Ultimate Webpage Enhancer! Instantly add many tweaks to any webpage including: Ad block, flash block, video download, remove delays, tooltip translation, link checker, rounded corners, auto pagerize, and more. A must have for all web users.

Rated 3 out of 5 stars (23)

1 user

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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

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Simpler English Dictionary Requires Restart

A Simpler English Spellchecker.

Not yet rated

1 user

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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

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