How can I add a search domain in Windows 7?

"Go to Control Panel → Network and Internet → Network and Sharing Center.
Click on Change Adapter Settings on the left side.
Right-click on your network adapter (normally ""Local Area Connection"" or ""Wireless Network Connection"") and select Properties.
Select Internet Protocol version 4 (TCP/IPv4) and click on the Properties button.
On the General tab, click on the Advanced… button.
In the Append this DNS suffixes list, add the domains you want, like google.com.

I just tried and it worked for me. By typing ""mailENTER"" in Firefox, I was sent to Google Mail."