When I get a URL wrong at the top level (i.e. when DNS lookup returns NXDOMAIN), my Firefox browser redirects me to
ask.com. How do I remove or customise this functionality? There's nothing obvious in the options dialogue and Google isn't being helpful—probably because I don't know the correct name for the error!
I'm running Windows, Firefox 3.0.14. Not malware, I think I accidentally installed it with realplayer or something.