With a feature that has been persistently requested for years, but there is no progress by firefox. First of all, it shows how much respect you show these users. Tl:Dr firefox:a zombie living in the light of the glory days of old.
I mean its almost there anyway, just make the adress bar and so on not reappear on scroll up. it takes about 20% of my vertical screen space in landscape mode on a tablet.
With its thick title bar and URL bar, it kinda looks like a desktop browser. However, the addition of a status bar makes the interface even bulkier, leaving less space for web pages. In contrast, browsers like Lemur allow you to hide the status bar, and their title and URL bars are noticeably slimmer.