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S3.Google Translator

S3.Google Translator adds the power of Google Translate’s automatic translations to your browser!
It supports translation of selected text, entered phrase or whole webpage between any of 80+ languages.

New Feature: Language learning!

Rated 5 out of 5 stars (218)
23,969 weekly downloads

Quick Locale Switcher

Allows you to quickly switch to a different language (User Interface, Spell Checker Dictionary and Website content) in your Mozilla application.

Rated 3 out of 5 stars (82)
2,121 weekly downloads

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)
1,944 weekly downloads

Rikaichan Japanese-English Dictionary File

This is a dictionary file add-on for the Rikaichan extension.

Rated 5 out of 5 stars (5)
1,743 weekly downloads

新同文堂 (New Tong Wen Tang)

NewTongWenTang is a tool to switch display Chinese content between traditional and simplified glyphs (中文繁簡體互轉工具)

Rated 4 out of 5 stars (96)
1,385 weekly downloads

www.Translate

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 (26)
1,112 weekly downloads

Simple Locale Switcher

An easier management of the user interface language

Rated 5 out of 5 stars (7)
946 weekly downloads

Rikaichan Japanese Names Dictionary File

A dictionary file for Rikaichan.

Rated 5 out of 5 stars (3)
570 weekly downloads

Todoist for Thunderbird

Todoist is a leading online task manager and we manage millions of todos! Todoist for Thunderbird makes it super easy to manage your todos and email directly from Thunderbird.

Watch a short video:
https://www.youtube.com/watch?v=VixEQJb5Qc0

Rated 3 out of 5 stars (16)
359 weekly downloads

AVIM

An input method editor (IME) for Vietnamese. Type Vietnamese diacritics directly into any Web page, Web app, or dialog box.
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Bộ gõ tiếng Việt cho phép đặt dấu trực tiếp vào bất kỳ trang Web, ứng dụng Web, và hộp thoại.

Rated 5 out of 5 stars (30)
355 weekly downloads

EHTip

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

Rated 5 out of 5 stars (58)
290 weekly downloads

Dictionary Switcher

Toggles dictionaries automatically or manually and displays the currently selected one

Rated 4 out of 5 stars (169)
275 weekly downloads

German Spell Check

Dies ist eine deutsche Rechtschreibprüfung, für die Suche nach Rechtschreibfehler.

Rated 3 out of 5 stars (7)
266 weekly downloads

English - English Dictionary

This is an English dictionary for looking up words in English.

Select a word using your mouse and find its meaning in English!

Rated 2 out of 5 stars (9)
238 weekly downloads

Finnish spellchecker

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

Rated 4 out of 5 stars (96)
205 weekly downloads

Spanish Dictionary for Spelling

Select a text in Spanish appearing on any web page and get a spelling check for it immediately!

Not yet rated
191 weekly downloads

Babylon Dictionary Word Search

Find the definition for a selected word in a web page or an email.
Right click over the selected word, choose the option "Search in Babylon" and that's it! You will have a new window with the definition of the selected word.

Rated 4 out of 5 stars (41)
181 weekly downloads

Transliterator No Restart

As-you-type phonetic conversion of text from one alphabet to another, as well as transliteration/detransliteration of selected text anywhere within documents. Supports multiple languages and custom transliteration schemes.

Rated 5 out of 5 stars (76)
171 weekly downloads

French Dictionary for Spelling

This is a French Spelling dictionary, for finding spelling mistakes.
Select a text in French appearing on any web page and get a spelling check for it immediately!

Rated 3 out of 5 stars (7)
160 weekly downloads

Rikaichan Japanese-French Dictionary File

A dictionary file for Rikaichan.

Not yet rated
145 weekly downloads