Keeping the breadcrumb navigation visible at all times isn’t a bad idea though.
When I do testing on Safari, it often annoys me that I need to do a meaningless scroll up just to make the navigation bar at the bottom appear, to go back a page. The trade-off here is if you want more screen or more convenience.
Also I just realized I’m talking about the bar at the bottom that allows you to go back or switch browser tabs.
This toolbar here:
The top bar only lets you change URL and refresh.