hello, what device are you using?

Sorry forgot to mention my device is a Samsung Galaxy Tab 3 8.0

The device has a menu button to the left of the home button.

There are no buttons at all. The only things showing is the URL window, refresh button and a square with a 2 inside it. Nothing else.

kbrosan was referring to the hardware buttons on your device below the screen.

Thanks for your help. Problem solved. I was wrongly looking for a menu button in Firefox instead of my device menu button.

I thought it would work like the Firefox PC version.