The extension is used for translation between Chinese and English.
It contains two features.
You can translate the word or sentence you double click to select on current page. It would popup a tip field containing explanations.
You can also translate the word or sentence you input on the popup window which would show on clicking the extension icon on the toolbar.
The extension would be quite convenient for Chinese user when they are browsing English web page. They can immediately translate the unknown English word with no need to leave the current page.