Yeah, I can see how that can end up messy, but filtering by url also doesn't always work. To give one example: I may open google docs in different containers be

Yeah, I can see how that can end up messy, but filtering by url also doesn't always work. To give one example: I may open google docs in different containers because I have several accounts (personal and work). So, if I receive a link to a doc that was shared to me, and open it from the mail client... it won't necessarily end up in the right container. It can end up working fine when you use the menu to open in another container, but on many sites, the original url is redirected to a login page or whatever and opening in another container is not going to be helpful at all because you've now lost the original link you needed to open.