I know Firefox has a Split View feature; however, it’s not as convenient as Vivaldi or the Arc browser. I love how The browser company implemented the Split View screen. Firefox Split View is pretty limited, and I’m unsure if it has improved since its release.
What does the community think about that?
Here is an example of Arc browser split view:
PowerToys has FancyZones for Windows.
It's a valiant effort to allow functionality for window tiling, but like the name suggests it's for arranging things on a screen. It can't really facilitate two windows behalf as if they're one window split in two.