I've been using this for a few months now and I love it. Along side temporary containers[1] and tridactyl[2] which gives - auto containerization based on url match - keyboard driven way to open new pages in a specific container FF transforms into a powerful browser OS running applications with hard boundaries. The only UX issue (which admittedly could be because I have changed the theme to be minimal by hacking userC…
whats a use case for temporary containers? Throwaway email? Does the called on server think you're a first time visitor each container?
But the primary usecase for me is to access a rarely used account temporarily without having to logout and login from the main account (AWS, Cloudflare, Google, etc).