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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 (11)
7,498 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)
14,174 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 (66)
12,311 users

Spanish (Spain) ChatZilla

Spanish (es-ES) Language Pack for ChatZilla

Rated 5 out of 5 stars (8)
1,637 users

Dictionary Switcher

Toggles dictionaries automatically or manually and displays the currently selected one

Rated 4 out of 5 stars (165)
26,988 users

Rikaichan Japanese Names Dictionary File

A dictionary file for Rikaichan.

Rated 5 out of 5 stars (3)
19,289 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 (97)
14,446 users

Rikaichan Japanese-German Dictionary File

A dictionary file for Rikaichan.

Rated 5 out of 5 stars (1)
4,027 users

Greek Translator

Translates English to Greek and vice versa.

Rated 4 out of 5 stars (7)
1,645 users

Leo Search

Searches for marked words in the database at dict.leo.org and opens the result in a new tab. The fastest way to search at leo.org. It supports English, French, Spanish, Chinese, Italian and Russian to German translation.

Rated 4 out of 5 stars (19)
9,911 users

FoxVox

FoxVox will speak any text you highlight in a web page. FoxVox can also create audiobooks in mp3, ogg, and wav formats. You can now easily turn your blogs and articles into podcasts.

Rated 4 out of 5 stars (39)
4,904 users

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)
236,177 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 3 out of 5 stars (15)
15,414 users

Finnish spellchecker

Finnish Spellchecker

Rated 4 out of 5 stars (96)
7,723 users

英辞郎 on the WEB

アルクのウェブサイト( http://www.alc.co.jp/ )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」( http://eowp.alc.co.jp/info2/ )にも対応。
※「英辞郎」は道端早知子氏の登録商標です。

Rated 3 out of 5 stars (2)
13,643 users

South African English spell checker

The South African English spell checker allows you to use place names, borrowed words, and other expressions that are unique to South Africa.

"No more eina, just a lekker spell checker!"

Rated 5 out of 5 stars (3)
2,644 users

weblioPane

文字列選択でWeblioから検索。
オン、オフの切り替えは右下のアイコン又はアドオンの設定より変更できます。
インストール直後のみ、表示してるページをリロードするまで動かないバグがあります。

[1.1] TextInput Formでは反応しない様、仕様を変更しました。
[1.1] 英単語のみを検索の設定を追加。
http://ejje.weblio.jp/

Rated 5 out of 5 stars (5)
4,348 users

translator

translator is web translation extension that allows you to translate any web page or text into nearly any language at the click of a button.

Rated 4 out of 5 stars (93)
26,268 users

Rikaichan Japanese-English Dictionary File

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

Rated 5 out of 5 stars (4)
43,642 users

English Spelling Dictionary

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

Rated 1 out of 5 stars (6)
1,102 users