Language Support


Language Pack Install Helper No Restart

Provide easy way to install Additional Language Packs.

Rated 5 out of 5 stars (10)
15,620 users

LEO Dictionaries

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 (6)
15,294 users

Google Selection Translate - For AltKey No Restart

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 (5)
13,854 users Translation

Translate words and phrases via from within any website or epub.
No add-on is faster, easier or more precise!
Use via mouse gestures, rocker gestures, modifier + mouseclick or via context menu.
No need to select the word, just click on it!

Rated 4 out of 5 stars (24)
13,685 users


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 (29)
13,621 users


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 (169)
13,018 users

Google translate for https/http No Restart

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 4 out of 5 stars (20)
12,956 users

Online Translator Toolbar

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)
12,395 users

Simple Locale Switcher

An easier management of the user interface language

Rated 5 out of 5 stars (7)
12,209 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 (7)
11,650 users

Perapera Chinese Popup Dictionary

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 (112)
11,209 users

Fast Translation

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

Rated 5 out of 5 stars (74)
10,705 users

DictionarySearch (Official Version)

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

Rated 4 out of 5 stars (115)
10,212 users

Leo Search

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

Rated 4 out of 5 stars (19)
9,322 users

英辞郎 on the WEB

アルクのウェブサイト( )にて公開しているオンライン英和・和英データベース「英辞郎 on the WEB」を、その場で便利に検索できる Firefox アドオンです。ダブルクリック検索、範囲指定検索などのクイックサーチ機能もついています。有料版「英辞郎 on the WEB Pro」( )にも対応。

Rated 3 out of 5 stars (2)
8,551 users


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 (29)
8,427 users

Grammarly Spell Checker & Grammar Checker No Restart

Spell check and grammar check as you type online. Boost your credibility everywhere you write!

Rated 4 out of 5 stars (7)
8,396 users

Finnish spellchecker

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

Rated 4 out of 5 stars (96)
7,789 users

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 (31)
7,585 users

Facebook Translate

Translate status updates and comments on Facebook. Seamlessly integrates into Facebook.

Rated 3 out of 5 stars (41)
7,482 users