Find the current launcher using the following command:

adb shell cmd shortcut get-default-launcher

Setting the new launcher requires you to install the new launcher and then run

adb shell cmd package set-home-activity "your.package/.YourLauncherActivity"

Replace the your.package/.YourLauncherActivity with the actual launcher package name

Whether this is Mozilla or Google, I have no idea how they could be this incompetent since they support the bottom tabs if the phone is folded but not when the phone is in full unfolded version. Millions of dollars spent on these high paid programmers and they still can't get it right. And pretty sure if I had signed up to get those jobs I wouldn't get those jobs. The irony.