How to Translate English and Japanese with the Dictionary Search plugin on Firefox

I use Dictionary Search plugin to translate English and Japanese. It is the easy and lightweight way because the words and sentences are just only traced and selected through the right-clicked context menu.

To use the dictionary search like this way, adds followings to prefs.js or user.js:

user_pref("dictionarysearch.menutext1", "Search Dictionary for \"$\""); user_pref("dictionarysearch.menutext2", "English->Japanese\"$\""); user_pref("dictionarysearch.menutext3", "Japanese->English\"$\""); user_pref("dictionarysearch.menutext4", ""); user_pref("dictionarysearch.url1", "http://dictionary.goo.ne.jp/search.php?MT=$&search_history=&kind=ej&kwassist=0&all.x=66&all.y=3&all=%BC%AD%BD%F1%A4%B9%A4%D9%A4%C6&mode=0"); user_pref("dictionarysearch.url2", "http://www.excite.co.jp/world/english/?before=$&wb_lp=ENJA"); user_pref("dictionarysearch.url3", "http://www.excite.co.jp/world/english/?before=$&wb_lp=JAEN"); user_pref("dictionarysearch.url4", "");