Hi ck.b there is no way that you can make firefox a full screen on your phone but if your are viewing a image on your phone through firefox than yes you can which you can do by Long press on any image and select 'view image' and Firefox displays it along with the address bar. Even if the image is massive. And you cannot get rid of the address bar to view the image full screen

Thank you fardeenbhuiyan, I fail to understand why one can watch a video full screen and have to be lumbered with the Android navigating bar in the bottom of what is a very small screen. I think there should be the possibility to use full screen on whatever application that is used, whether this is a lack from Android or Mozilla, I am not an expert to know.

Hi

The bar that you are talking about is managed by the Android operating system on your device, not Firefox for Android.