Mozilla provided an add-on API for the Container Tabs, so maybe someone writes an add-on to do this. Or if you want to get your hands dirty yourself, you can tr

Mozilla provided an add-on API for the Container Tabs, so maybe someone writes an add-on to do this. Or if you want to get your hands dirty yourself, you can try writing one yourself. I imagine hard-coding a few URLs and respective Container Tabs wouldn't be that much work.