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WordReference Translator

Open a tab with WordReference's translation for the selected word. Through a floating link, or by pressing "D" key.

Rated 3 out of 5 stars (26)
8,207 users

everygain Translator

Translates anything for you right on the page. The everygain Translator is available for Firefox and Thunderbird.

Rated 4 out of 5 stars (12)
8,016 users

y-Translate No Restart

Minimalistic inline words, selected text translation using google translate

Rated 5 out of 5 stars (29)
7,879 users

Google Translate It No Restart

This jetpack allows you to quickly translate text with Google Translate.

Rated 5 out of 5 stars (4)
7,729 users

After the Deadline - Spell and Grammar Checker

After the Deadline is an intelligent grammar, style, and spell checker. It works with most web sites.

Rated 3 out of 5 stars (53)
7,300 users

Globefish Instant Translator & Expression Checker

Globefish assists users in reading and writing in a foreign language: (1) users can translate any foreign text simply by highlighting it; (2) users can compare usage frequency of different expressions to check errors and find a better expression.

Rated 4 out of 5 stars (79)
7,265 users

goo Dictionary

Shows your search history of "goo dictionary" as Firefox menuitem.

Rated 4 out of 5 stars (7)
7,144 users

Babbel (Beta) No Restart

Behalte Deinen Lernerfolg im Blick mit der neuen Babbel (Beta) Firefox-Erweiterung.

Rated 3 out of 5 stars (1)
6,676 users

Euskalbar

Basque dictionaries. Euskalbar is a Firefox toolbar that helps translating words from Basque to English, French, German, Spanish, Japanese and Latin, and from English, French, Spanish, German, Japanese and Latin to Basque.

Rated 5 out of 5 stars (28)
6,371 users

Dictionary (EN/DE)

This extension easily translates selected words from English to German and vice versa using the BEOLINGUS Dictionary of the Chemnitz University of Technology (dict.tu-chemnitz.de). The results are displayed in a small popup window, in which you...

Rated 5 out of 5 stars (15)
6,339 users

Inline Translator

Easy to translate words you want. Just select text! it will be translated to your language! (37 languages supported)

Rated 4 out of 5 stars (97)
6,292 users

LanguageToolFx – Style and Grammar Checker No Restart

Check selected text on websites or text in text fields with the free style and grammar checker LanguageTool.

Rated 5 out of 5 stars (2)
6,155 users

Grammarly Lite - Smart Spellchecker

Get a FREE tool to write without mistakes on Facebook, Gmail, Twitter, Tumblr,
Linkedin, and anywhere else on the Web.

★ Contextual spell checker
★ Grammar check
★ Punctuation correction
★ Thesaurus
★ Dictionary

Rated 4 out of 5 stars (19)
6,146 users

Liquid Words

This add-on is no longer actively supported, I simply could not afford the upkeep.

If you are a Mac user please visit www.liquid.info

I am sorry guys.

Rated 4 out of 5 stars (225)
6,139 users

bab.la dictionary toolbar

Translate from English to Spanish, Czech, Danish, Dutch, Finnish, French, German, Indonesian, Italian, Japanese, Norwegian, Polish, Portuguese, Russian, Swedish and other languages, including pronunciation, synonyms, grammar and usage examples.

Rated 4 out of 5 stars (36)
6,085 users

East Asian Translator

Translate web pages and selected passages in Chinese, English, Japanese and Korean, using the translation service provided by excite.co.jp. ...

Rated 4 out of 5 stars (10)
6,063 users

EHTip

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

Rated 5 out of 5 stars (50)
5,999 users

Life Science Dictionary Tool

Life Science Dictionary Tool is a mouseover dictionary that translates life science terms with vast numbers of English and Japanese terms available with information from life science dictionary project (http://lsd.pharm.kyoto-u.ac.jp/ja/index.html).

Rated 4 out of 5 stars (9)
5,780 users

Dictionary.com

Select word, click on toolbar button and tab will open with explanation on dictionary.com. With this add on you can look up words in dictionary and thesaurus at dictionary.com and thesaurus.com or check the spelling at spellcheck.net.

Rated 3 out of 5 stars (30)
5,755 users

Zotero bibliography Locale Switcher

This add-ons add a sub menu in Zotero to change the bibliography export locale.

Rated 5 out of 5 stars (3)
5,453 users