I'm assuming you've seen https://addons.mozilla.org/en-GB/firefox/addon/multi-account... ?
It doesn't work in exactly the same way - you don't by default get a different window per-profile. Instead, tabs get a different colour for each.
It doesn't work in exactly the same way - you don't by default get a different window per-profile. Instead, tabs get a different colour for each.
You can also use Firefox's about:profiles page can to open and manage different profiles in different windows in one running instance of Firefox.