Scrolldown / swipe towards the bottom and it should appear. By the default all the screen is dedicated to showing the content, to show the top bar address you need to make it visible on purpose.

Thanks but it is the back button that I am missing. the address bar is there but the screen shots show a back button.

Hi barneyfife, Can you post a screenshot here so that we can understand what you are trying to say! :)

The back button is the back button on the phone. Space is limited so that button is not duplicated in the phone UI. On tablets we have a navigation button similar to desktop Firefox.