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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.

Rated 5 out of 5 stars (83)

174,536 users

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English (Australian) Dictionary

Australian English Dictionary for Mozilla applications.

Rated 4 out of 5 stars (126)

9,534 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)

2,397 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)

9,653 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This dictionary is no longer maintained.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)

4,899 users

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Thesaurus - Reference.com

Thesaurus suggestions at your fingertips.

Rated 4 out of 5 stars (24)

175 weekly downloads

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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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EHTip Requires Restart

Word translation in tooltip with English⟷Croatian dictionary already incorporated.

Rated 5 out of 5 stars (64)

0 users

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Quick and right translation of single words, phrases and even whole sentences for English, German, French, Spanish, Portuguese, Italian and Russian. Look-up in general-purpose and specialized PROMT dictionaries, transcription and pronunciation.

Rated 4 out of 5 stars (9)

87 weekly downloads

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always ".com" - Google.com (in English)

Tired of being redirected to a local Google site when you specifically want Google.com?

Use "Google dot com", not "dot something else". Use Google.com, in English, without being redirected to a country-specific Google site when you're not in the US.

Rated 4 out of 5 stars (65)

65 weekly downloads

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