Sure, you can do all that, but then I think you're in docker-land or something similar, and you are essentially building a system that works the way you think i

Sure, you can do all that, but then I think you're in docker-land or something similar, and you are essentially building a system that works the way you think it does, and it may not reflect reality (arguably that is most testing). And I think if someone is to build this containerized system for testing, it shouldn't necessarily be some app developer like me, it should be someone like the chromium or firefox team that know exactly how the browsers expect to communicate