Facebook Update Floating Navigation Bar

I don't know if you notice your Facebook navigation bar floating when you scroll down. This update is actualy from from 2011 and few have seen this.

Now many Facebook users are seeing the site’s top navigation bar locked to the top of the browser window no matter where they scroll. This floating navigation bar gives users access to their notifications, friend requests, messages, and links to the home page, profile, and account settings at all times. Previously, if users scrolled down the news feed, a profile, or other page on the site the top navigation bar would scroll with it and become hidden from view.