"Kuai-Translator"-instant translation extended (A simple translator add-on for firefox), is a convenient extended to support multiple languages, translation, translation of words can also be a WIKI query.
About this Add-on The idea came to me until the use of translation of extension Quick Translator , some time ago because the Google API can not connect, so his imitation of the extansion,use Baidu API instead of Google's.
you can download the .xpi file from https://addons.mozilla.org