DictCN

I find a wonderful add-on for Firefox right now, DictCN, which is an online English to Chinese (and vise versa) dictionary extension for FF developed by Google Code. With the DictCN I think Kingsoft's CIBA can be rarely started in your computer.

To use DictCN, simply hover the mouse (coming with 3.0) upon the word you want to translate , or select it (drag or double-click to highlight the word), the translation (pronunciation and explanation) will show up soon in a layer on the same web page.

You may click on the 'D' icon on the status-bar to activate and deactivate DictCN (color of the icon changes correspondingly). You may also press ctrl-alt-d short-key to do the job.

By Moving the mouse over the translation, you can hear the speech, and a click on it will bring you to the detailed explanation page.