I have. It simply sorts tabs by profile, rather than sorting whole windows. Think about it this way: I want to have 6 separate instances of Firefox running at the same time, where I can seamlessly switch between them. Each instance has its own theme, bookmarks, cookies, etc.

Firefox can do this, but it's not intuitive and it opens 6 different Firefox apps on my Mac, so it isn't easy to distinguish between each profile. On Chrome, I simply click the person switcher at the top right and I can switch between sessions very easily.