Why did the address bar stop hiding when moving down pages? (android)

Before the awesome switch or close tabs button showed up… while moving down a webpage the whole address&tabs bar would slide off the top of the screen allowing more of the screen to show the website. Then when moving back up the page all of that would slide back down and be visible.

But after the switch or close tabs button showed up… the address&tabs bar just stays put all the time which is extremely annoying and I don’t see a setting anywhere to turn that back on where the addy&tabs bar goes away.

Please make it a setting, or get the addy&tabs bar back behaving how it was.