Glad you're enjoying Firefox but I'm afraid the multi account feature isn't exclusive. Chrome allows multiple Google accounts to be signed in and you can create new windows for each user that are color-coded.
That is right, but in Firefox it's a different, better feature. The different web contexts don't have to be tied to a user, you can create as many as you'd like, even programmatically, and they all live in the same window (or in as many windows as you'd like). It's a killer feature for Firefox, and something that's not found in other browsers.