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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

Dict

Looks up the definition of words on a Web page.

Rated 5 out of 5 stars (15)
3 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

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

English-Russian dictionary

Spelling of English and Russian words

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

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

The Free Dictionary Search

Helps you search for word definitions at TheFreeDictionary.com

Rated 5 out of 5 stars (4)
15 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

English (Australian) Dictionary

Australian English Dictionary for Mozilla applications.

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

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

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

Google (Language: EN)

English language-specific Google search.

Rated 4 out of 5 stars (13)
6 weekly downloads

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

Thesaurus - Reference.com

Thesaurus suggestions at your fingertips.

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

United States English Spellchecker

This dictionary is no longer maintained.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

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

MyDict Online Chinese-English Dictionaries

MyDict All-in-one Online Chinese-English dictionary integrates all the online dictionaries like dict.cn, baidu, dictionary.com in one place. As sometimes you need to compare many online dictionaries to get the precise meaning, now you can use MyDict.

Rated 5 out of 5 stars (2)
0 weekly downloads

Translate Hebrew to English

Translate hebrew to english with google translate service.

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

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

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

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