Add-ons

French spelling dictionary by OR

Spelling dictionary for the French language.

Quick Locale Switcher by ppclick

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

Arabic spell-checking dictionary by Dan Kenigsberg

Arabic spell-checking dictionary for Firefox 3 and Thunderbird 3 from Ayaspell.

United States English Spellchecker by jooliaan

This dictionary is no longer maintained. Use this dictionary instead.

Transliterator by Alex Benenson

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.

BiDi Mail UI by The BiDi UI Team, Eyal Rozenberg

Direction control and BiDi-related charset misdetection correction

Charset Switcher by yuoo2k

Supports to customize the Default Character Encoding for each sites.

Collector's Note "Very helpful when regularly visiting sites that lie about the character encoding they use."

Urban Dictionary by kefka781

Search using Urban Dictionary

Babylon Dictionary Word Search by marioalv

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.

Collector's Note Fast, efficient, in-intrusive. Works with THunderbird too.

Any key by Roman Mironenko, taye

Allows typing into phonetic Russian, Ukrainian, Amharic, Arabic, Armenian, Hindi Davangari, Hebrew, Mongolian, greek... transforming translit into the choosen language...

Collector's Note "Saves me switching keyboard all the time. Work as expected and easy to configure."

Force RTL by Kai Liu, Ehsan Akhgari, others

Force a LTR locale to behave as if it was a RTL locale.

UrlCorrector by durilka, Vasiliy Temnikov

Type web addresses always in Latin letters no matter of your current keyboard layout.

mid by Attila Szabó

More than 2000 dictionaries in 270 Kilobyte! Search multiple dictionaries at once!

WikiLook by TestPilot, Rasha

Leading dictionary lookup add-on. Fast, light, open source tool that define words for you without need to open new tabs or windows. Wiktionary&Wikipedia.

Ctrl or Shift or Alt + RightMouseButton click. Now with thesaurus.

70+ languages supported!

Google (Language: FR) by Jeremy Morton

French language-specific Google search.