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abcTajpu

Type in accented letters, international characters or symbols into Firefox or Thunderbird, either simply by using a context menu (there being support for many languages), or quickly by keyboard macro (you can even define your own).

Rated 4 out of 5 stars (69)
3,589 users

Rikaichan Japanese-French Dictionary File

A dictionary file for Rikaichan.

Not yet rated
2,824 users

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)
2,695 users

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
2,666 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)
2,654 users

Automatic Dictionary No Restart

Extension that remembers the language of the spellchecker used when composing and switches to it every time you write to that person.

Rated 5 out of 5 stars (19)
2,505 users

Grammar Checker

Checks grammar using LanguageTool facilities.

Rated 4 out of 5 stars (4)
2,490 users

Look Up in Dictionary

Looks up a selected word in OS X's Dictionary.app

Rated 5 out of 5 stars (41)
2,203 users

SelectionSK

Pops up user menu with useful tools (copy, highlight, translation, search, etc.) when text is selected with the mouse

Rated 5 out of 5 stars (64)
1,484 users

Zombie Keys (Multilanguage Keyboard)

Enter accents, diacritics, diaeresis, umlauts, ligatures etc. with keyboards of various countries (us,uk,ie,fr,it,ru,de,sv) - via easy to remember shortcuts or menu. Also supports all textboxes of the application (such as search, filters).

Rated 5 out of 5 stars (22)
1,365 users

AutoUp

Transform the first letter of a sentence in uppercase

Rated 3 out of 5 stars (7)
1,283 users

Padma

Padma is a technology for transforming Indic text between public and proprietary formats. The technology currently supports Telugu, Malayalam, Tamil, Devanagari (including Marathi), Gujarati, Bengali, and Gurmukhi...

Rated 4 out of 5 stars (34)
1,220 users

Fire Shabelet

Fire Shabelet is a Japanese Voice Reader Software for Mozilla powered by VDS.

Rated 5 out of 5 stars (1)
1,160 users

XUL/Migemo

This includes 3 features about the find toolbar. First, the dictionary-assisted find. Second, more customizable Find Toolbar. Third, the highlight feature like Safari 3.

Rated 4 out of 5 stars (48)
961 users

Rikaichan Japanese-Russian Dictionary File

A dictionary file for Rikaichan.

Not yet rated
877 users

Moji

An integrated sidebar-dictionary for Japanese and Chinese including kanji dictionary.

Rated 4 out of 5 stars (10)
769 users

Zhong Wen

Mouse over a Chinese character to find out it's meaning. A popup will appear showing the 'Pinyin' pronunciation, the simplified character form, and the English translation. You can customize what parts to show on the preferences window.

Rated 4 out of 5 stars (20)
728 users

CantoFish

CantoFish is a popup Cantonese-English dictionary for Firefox. It contains over 200,000 entries and works with both traditional and simplified Chinese characters. The Yale and Jyutping romanization systems are supported, as well as Mandarin pinyin.

Rated 5 out of 5 stars (23)
688 users

Character Palette

Firefox toolbar for selecting strange characters that are not on my keyboard.

Rated 3 out of 5 stars (12)
592 users

Sztakidict SZTAKI Szótár a középsõ ujjban

Online Hungarian<->English dictionary by SZTAKI based on Jaap A. Haitsma's Dictionary Search 0.4
Modified by Danidek to be installable for Firefox 4.0 and later

Not yet rated
558 users