Is this a defect?

Is this defect?  When i opened FB just now, i witnessed this behavior.

What can be a reason for this behavior?  Have to analyse !!

This is my Environment.

• Web Browser - Chrome 27.0.1453.116
• Operating System - Microsoft Windows Vista
• Screen Resolution - 1280 x 800
• Browser Size - 1280 x 642
• Javascript - Enabled
• Flash Version - 11.7.700
• Colour Depth - 32 bit

Now, How to get the above details in an easy way.  Just open www.supportdetails.net in your browser.