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How to add StarDict to your firefox search bar?
Click the next link is OK.

Install Oak Vocabulary for Firefox.
Oak Vocabulary let you check up new words from the webpage, including StarDict.org.
You can install it from here.
You can add StarDict.org to it:
Dictionary: StarDict
Encoding: UTF-8
Query URL: http://www.stardict.cn/mini.php?q=$$$$