Google tests now hide the 'www.' on the hostname in search results

Here's how you can enable the experiment:

• Go to Google.com and load your browser's developer console:
  
• Google Chrome: Tools, Developer Tools
• Mozilla Firefox: Web Developer, Web Console
• Internet Explorer: Developer Tools (F12), Console
• Copy and paste the following code:
  

  document.cookie="NID=67=j6b0tb9t2YB77Avg0zq1Ep0KF0W036PJEHW5JE8pVzUY5Nrz_zK5VM7lnpB2Q6OYXHMlcCkwrD9KNlDYcbQ2XaCjMYLjjwcQT0f9vLgZWMOUuBNod0sU0q8Ry7yxJWmY; path=/; domain=.google.com";window.location.reload();

• Press Enter and you'll see the experiment.

If doesn't work, try this other method:

• Open Chrome and install this extension.
  
• Go to Google.com and select "Edit Cookies" option on the context menu:
• Find a cookie named NID and replace the value with this cookie value:
  

  67=j6b0tb9t2YB77Avg0zq1Ep0KF0W036PJEHW5JE8pVzUY5Nrz_zK5VM7lnpB2Q6OYXHMlcCkwrD9KNlDYcbQ2XaCjMYLjjwcQT0f9vLgZWMOUuBNod0sU0q8Ry7yxJWmY

• Click "Submit cookie changes" and refresh the page.