[Certhas]

I regularly use multiple profiles in Firefox.

Firefox also has containers which (AFAIK) Chrome lacks. The UI for Profiles is probably worse, but Containers dramatically reduced the need for them for many (but by no means all) use cases.

It's definitely not the case that Firefox is behind here. I would say they are slightly ahead overall, but which of the Browsers is ahead depends on your specific use case.

It should be fairly obvious that this has nothing to do with the reason that Chrome has 10 times more users.

[mcfedr]

It's my personal reason))

I've tried containers, maybe something got better, but I just simple, one window with everything in my work profile, another window, everything in personal, it's so easy to use in chrome. I can close the work window at the end of the day, and open it again the next morning, carry on