Mouseover or shortcut with Google chrome extension –

I have created an extension that i try to improve. I'm not an expert at user experience that why i ask you if i'm doing it right or wrong.

The extension works with google search engine. When you search something on the search engine, google shows you 10 link or more. With my extension you just have to mouseover the link and website is show inside a "smooth popup".

The question is, do you think it's better to add shortcut to show the website, or mouseover is ok as user experience ?

There is what's the extension looks like :