Firefox v79
After updating Firefox on my Samsung A20, I went through settings and changed only the location bar to the top.
I opened my website, wci-software.com, and discovered that the objects on the display were not in the right places; when the device was rotated landscape/portrait, the css @media statements had no affect (innerWidth, innerHeight); the rotation left a blank space at the bottom of the screen the size of the new bottom location bar, which I had set to be at the top.
I can't find a way to go back to the previous Firefox version, the one that WORKS!
My app development has come to a stop since I anticipate (?) fixes and I do not want to make adjustments to my apps to facilitate a busted-ass Firefox release.