Google chrome Extensions 
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Wordpress Plugins 
Mozilla Firefox Addons 
The next generation Rikaichan dictionary catered for translators and Japanese enthusiasts. A fan creation by a single wholehearted translator.
A Korean popup dictionary based on Rikaichan
Requires the additional dictionary addon.
Provides easy inline interface for dictionary service while reading news/articles.
No need to go to separate tab and type keyword to get details, just double click on the word (or right click for link) and details will be displayed on the same page.
The official extension from the people at Dictionary.com, the most popular and trusted online dictionary and thesaurus, to look up word definitions and synonyms anywhere you go with Firefox via a simple pop-up.
Select any word on a webpage and get Google Dictionary's definition in a panel. Can look up words in many languages.
A minimalism English-English Dictionary. Move your mouse pointer over a word and hold CTRL key for a second to see its definition. Possibly, KitaDic is the least obtrusive dictionary extension ever made.
Japanese to English/German/French/Russian dictionary. Just hover the mouse on top of a word, and a popup appears. Automatically de-inflects verbs and adjectives. Detailed kanji view...
Show, in a new Tab, the meaning of a selected English word with the site Dictionary.com, Thesaurus.com, Reference.com or Reverse Dictionary.
More than 2000 dictionaries in 270 Kilobyte! Search multiple dictionaries at once!
Dictionary, translation, thesaurus, Text-to-Speech, bilingual phrase pair and more
This is additional dictionary file for use with the Perapera Japanese Pop-up Dictionary add-on.
This is additional dictionary file for use with the Perapera Japanese Pop-up Dictionary add-on.
This is additional dictionary file for use with the Perapera Chinese Pop-up Dictionary add-on.
This is additional dictionary file for use with the Perapera Chinese Pop-up Dictionary add-on.
