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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)
173,301 users

English (Australian) Dictionary

Australian English Dictionary for Mozilla applications.

Rated 4 out of 5 stars (126)
9,467 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)
2,376 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)
9,460 users

United States English Spellchecker

This dictionary is no longer maintained.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

Rated 4 out of 5 stars (207)
4,878 users

Thesaurus - Reference.com

Thesaurus suggestions at your fingertips.

Rated 4 out of 5 stars (24)
175 weekly downloads

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)
4 users

Translate.Ru

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

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

Wiktionary (en)

Search Wiktionary.org, the free-content multilingual dictionary quickly and easily - and without wasting time and bandwidth on ads.

Rated 5 out of 5 stars (8)
46 weekly downloads

English-Russian dictionary

Spelling of English and Russian words

Rated 4 out of 5 stars (22)
1,447 users

Google translate to Farsi

Translate using Google translate service for any language to Farsi
1
بوسیله این مترجم می توانید از تمام زبانها به فارسی ترجمه کنید

Rated 5 out of 5 stars (12)
28 weekly downloads

Translate German to English

Translate german to english with google translate service.

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

LikeThePage - Facebook Like Any Page! Requires Restart

Easily share web pages you like with your friends and see how many people on Facebook like the page you are on!

Rated 4 out of 5 stars (30)
0 users

Translate Japanese to English

Translate japanese to english with google translate service.

Not yet rated
24 weekly downloads

Dict

Looks up the definition of words on a Web page.

Rated 5 out of 5 stars (15)
4 users

爱词霸 词典

免费在线词典 在线翻译

Rated 3 out of 5 stars (6)
22 weekly downloads

Translate English to Czech

Translate english to czech with google translate service.

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

Translate Korean to English

Translate korean to english with google translate service.

Not yet rated
19 weekly downloads

Google PL-EN-PL

Search in English-language-based pages using Polish language

Not yet rated
18 weekly downloads