Comment by dwaite

I thought the IBOS kernel leveraged L4 (Pistachio?)

I believe generally the push has been to better use the isolation feature in existing operating system environments - such as having separate processes for rendering and javascript execution per origin which also have unique sandboxed storage. From a platform vendor as browser vendor perspective, building what amounts to a new operating system running at the hypervisor layer is a huge effort that amounts to them now having one more internal OS to secure.

So I would instead expect this to be more of a research platform task, like perhaps something you would see on Genode.