By placing this link (Whois) in your link bar, you will be able to lookup the
whois on any domain while you are visiting them. To use, just click on the
link while at the other site and it will show you the whois information.
To install this link, this link must be dragged to the link bar.
Once installed you don't have to leave a website to see who owns it.
Google Toolbar Plug-in
You must have Microsoft Internet Explorer installed to use this feature.
Firefox Search Extensions
Installing these extensions will add another search engine for Firefox's search box in the upper right corner.