Having separate accounts, bookmarks, history, state, and extensions for: * My personal usage. * My professional usage. * Each individual client I contract fo

Having separate accounts, bookmarks, history, state, and extensions for: * My personal usage. * My professional usage. * Each individual client I contract for. * Testing out extensions. * Local development playground. It's extremely convenient to have all of this be just 2 clicks away the way Chrome has it, simple and intuitive to use. I have all of this in Firefox as well, but it's not as easy to set up and use, difficult to navigate and hard to look at. Plus links always open in the default profile instead of the last active one so I always have to copy things around and shuffle windows. I can deal with this, other people don't and won't. It has to Just Work™ like it does in Chrome. They use Chrome because that's where it's easy. And because of that Firefox looses potential users.