I don’t like Snap Previews. Far too often I get them popping up because my mouse pointer just happened to hover over a link unintentionally. Basically, if I want to see what’s behind a link, I’ll click on it. Displaying previews, expecially when I don’t want them is really just stealing my bandwidth.
You’ll find your hosts file in
C:\Windows\System32\drivers\etc\hosts on Windows or in
/etc/hosts on OS X and Linux.