Guess what!?
I finally succeeded to make my own OS but as a Chrome/Edge extension.
https://beta-japan.com/
First off, please just see pics!
This OS has an internal code editor so you can make any apps on this OS. In this example, I made Tetris.
3D vision
It's made for managing your browser tabs just like OneTab.
You can put your tabs, bookmarks, links, texts, and folders anywhere on the virtual desktop.
Also, there are 9 different VR desktops you can use at the same time.
Each desktop screens are like Google Maps not like conventional Windows or Mac or Linux, so you can expand the screen size as far as you want.
Currently, the development has been finished around 83%
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UPDATE:
Now it's available!!
https://beta-japan.com/