ImTranslator

ImTranslator Firefox Addon is a very good online translator addon which performs real-time translation for Albanian, Arabic, Bulgarian, Catalan, Chinese (Simp.), Chinese (trad.), Croatian, Czech, Danish, Dutch, English, Estonian, Filipino, Finnish, French, Galician, German, Greek, Hebrew, Hindi, Hungarian, Indonesian, Italian, Japanese, Korean, Latvian, Lithuanian, Maltese, Norwegian, Polish, Portuguese, Romanian, Russian, Serbian, Slovak, Slovenian, Spanish, Swedish, Thai, Turkish, Ukrainian, Vietnamese languages and their combination. TTS Voice presented by animated speaking characters will read the text in the most realistic, human-sounding way in a variety of languages: English U.S., Chinese, French, German, Italian, Japanese, Korean, Brazilian Portuguese, Russian and European Spanish.

Spell Checker delivers full-featured high-quality spell-checking tool for accurate input of information in English, French, German, Italian, Portuguese, Russian, Spanish, and Ukrainian languages.
Multilingual Dictionary provides the translation of single words, common phrases and idiomatic expressions for English, French, German, Italian, Portuguese, Russian, Spanish languages and their combinations.

Virtual Keyboard supports multilingual text input in Arabic, Bulgarian, Czech, Danish, Dutch, Estonian, Farsi, Finish, French, German, Greek, Hebrew, Hindi, Hungarian, Icelandic, Irish, Italian, Latvian, Lithuanian, Norwegian, Portuguese, Polish, Romanian, Russian, Slovak, Slovenian, Spanish, Swedish, Turkish, Ukrainian, and Urdu languages.

Russian Decoder identifies the encoding of a Russian text, and converts it, if needed, into the Cyrillic (Windows) standard encoding. Decoder can also be used to convert the Russian text into Latin characters (transliterate).

The interface of ImTranslator is localized for English, Chinese, Dutch, French, German, Italian, Japanese, Korean, Portuguese, Russian and Spanish languages. (coming soon: Czech, Danish, Finnish, Greek, Hebrew, Hindi, Latvian, Lithuanian, Norwegian, Polish, Romanian, Swedish, Turkish, Ukrainian)

We highly recommend this plugin if you are not a native English speaker and use any of the above languages. It is also useful if you are a English language user but visit other language websites on the web.

You can download the theme from the official Firefox plugin repository at:

https://addons.mozilla.org/en-US/firefox/addon/2257/