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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 (8)
13,568 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 4 out of 5 stars (8)
12,920 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.

Rated 4 out of 5 stars (8)
11,980 users

Language Pack Install Helper

Provide easy way to install Additional Language Packs.

Rated 5 out of 5 stars (10)
11,585 users

Dict.cc Translation

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 (33)
11,239 users

Google Translate Anywhere (Dictionary Anywhere) Featured

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

Rated 4 out of 5 stars (29)
11,013 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 (23)
9,972 users

QuickWiki Requires Restart

Quick lookup in Wiktionary and Wikipedia, without the need to open a new tab.
Just right-click a word while shift / ctrl / alt is pressed.

Rated 4 out of 5 stars (137)
9,920 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)
9,868 users

LanguageToolFx (only for old versions of Firefox)

[Do not use for Firefox 48 or later - use add-on "LanguageTool Grammar Checker" instead] Check selected text on websites or text in text fields with the free style and grammar checker LanguageTool.

Rated 5 out of 5 stars (7)
9,811 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)
9,650 users

Google Words And Page Translation

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

Rated 4 out of 5 stars (3)
9,099 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 (120)
8,918 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 (168)
8,665 users

DictionarySearch (Official Version) Requires Restart

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

Rated 4 out of 5 stars (115)
8,076 users

Fast Translation Requires Restart

Easy translation tool using Google Translate. Select text and right click to translate. Press CTRL+SHIFT+L to open translation window.

Rated 4 out of 5 stars (99)
8,040 users

Finnish spellchecker Requires Restart

Finnish open source Voikko-spellchecker for Mozilla and needed libraries.

Rated 4 out of 5 stars (98)
7,433 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)
7,368 users

Text-to-Speech (Google™ & HTML5)

Google™ Text-to-Speech is a text to speech engine with natural sounding voices.

Rated 4 out of 5 stars (38)
6,723 users

YandexTranslate:anything-Russian & Russian-English

Translate selected word or phrase over translate.yandex.ru from any lang to Russian (or from Russian to English) - result in context menu (right click) and in popup. Minimum and fast. Not affect DOM. Unofficial extension - works by using API.

Rated 4 out of 5 stars (33)
6,542 users