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.
I find the browsers’ various implementations to be far inferior to the built in system split screen. They really overwork my already overstimulated ADHD brain.
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.
The truth is there is not a tool out there for every use case that gets posted here. You're going to have to weigh your options and pick what works closest to what you need. In my case, opening a new browser window will make my compositor mimic this behavior to an acceptable degree. Also in my case, it will not work on Windows. This is a trade off I am willing to make. It also might not be the best idea to want a feature bloated browser. How many people will use this over PowerTools/their preferred Linux compositor? Probably not many.