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LEO Dictionaries Requires Restart

This is the official add-on for easier access to LEOs Online Dictionaries. Select any word or phrase, right-click on the selection and translate from/to English, French, Spanish, Italian, Chinese, Russian, Portuguese and Polish to/from German.

Rated 4 out of 5 stars (9)
12,859 users

Dictionary (Google™ Translate) Anywhere Compatible with Firefox 57+ Featured

"Dictionary (Google™ Translate) Anywhere" extension provides access to a floating multilingual Google Translate panel on any webpage.

Rated 5 out of 5 stars (55)
12,647 users

Google Selection Translate - For AltKey

Selecting text and holding alt key, translated results will show up on current web pages. No need to leave current web pages. Translate results come from Google Translate.

Rated 5 out of 5 stars (43)
12,257 users

Grammalecte [fr]

French grammar checker.
Included: conjugation tool, lexicographer, text formatter and spelling dictionaries.

Rated 4 out of 5 stars (12)
10,095 users

LanguageTool Grammar Checker Compatible with Firefox 57+ Featured

With this extension you can check text with the free style and grammar checker LanguageTool. It finds many errors that a simple spell checker cannot detect, like mixing up there/their, a/an, or repeating a word.

Rated 5 out of 5 stars (16)
9,674 users

Dict.cc Translation Compatible with Firefox 57+

The add-on uses dict.cc to translate words and phrases in any website, epub or pdf. In-page translation. No need to select the word, just click on it!

Rated 4 out of 5 stars (47)
9,593 users

Language Pack Install Helper

Provide easy way to install Additional Language Packs.

Rated 5 out of 5 stars (12)
8,950 users

Language Manager Requires Restart

Language Manager, Designed to manage language packs for Firefox web browsers this easy to use utility make it easy to manage installed language packs and always have the latest language pack installed.

FIREFOX ONLY

Rated 4 out of 5 stars (9)
8,328 users

German Spell Check Requires Restart

This is a spelling dictionary, where you can select a text in German, click on the icon (German flag) and get your text checked against spelling mistakes.

Rated 3 out of 5 stars (7)
7,442 users

Google translate for https/http

Translate entire web page or selected text using google translate
There are many translators on Firefox. There are two features they're not supported:
1.HTTPS pages
2.Page logined
This addon can translate all pages you can open in firefox

Rated 3 out of 5 stars (24)
7,300 users

Perapera Chinese Popup Dictionary Requires Restart

Put your mouse over any Chinese words on a webpage and it gives you the pronunciation and definition. English, German, & French dictionaries; Pinyin and Zhuyin supported; Simplified or Traditional characters. Save and export words for studying later!

Rated 4 out of 5 stars (123)
7,187 users

Google Words And Page Translation

A simple words and page translation tool by using Google Translate.

Rated 3 out of 5 stars (7)
7,004 users

Leo Search Requires Restart

Searches for marked words in the database at dict.leo.org and opens the result in a new background tab. It supports all languages provided by leo.org. Press "Ctrl" key to open the search result in a new foreground tab.

Rated 4 out of 5 stars (19)
6,340 users

Online Translator Toolbar Requires Restart

Free Online Translator Toolbar help you to translate whole web page, selected text on web page or text from Clipboard using one of free online translate services. Also you can translate single words using one of free online dictionaries

Rated 4 out of 5 stars (48)
6,253 users

www.Translate Requires Restart

Multi-Translator from Google, Bing and Pragma.
Translation tool for your Firefox and Thunderbird with a simple and friendly interface.

Rated 4 out of 5 stars (31)
5,928 users

SelBlocks (for Selenium IDE) Requires Restart

This is a language extension for Selenium IDE that provides javascript-like conditionals, looping, callable functions, error catching, and JSON/XML driven parametrization.

Rated 4 out of 5 stars (2)
5,898 users

DictionarySearch (Official Version) Requires Restart

Looks up a user selected word in an online...

Rated 4 out of 5 stars (115)
5,856 users

gTranslator Requires Restart

Google translate gadget for firefox. This extension translates entire webpages into a language of your choice with one click. Idea comes from Google Translation Bar for Chrome.

Rated 4 out of 5 stars (149)
5,726 users

Reverso Translate in Context Compatible with Firefox 57+

Translate words and expressions in context and improve your language skills. Spanish, French, Russian, Italian, etc.

Rated 4 out of 5 stars (28)
5,632 users

QuickWiki Requires Restart

Quick lookup in Wiktionary and Wikipedia in the current tab

40 languages of Wikipedia and English Wiktionary(at least for now) are supported.

Double-click a word (or select the word/set of words) and then use the right-click menu to look it up.

Rated 4 out of 5 stars (121)
5,520 users