I mean, Firefox has had profiles for years before chrome did. And then they had multi-account containers and chrome still doesn’t have those. And now they have a new distinct feature that they’ve given the same name of profiles that is just slightly different from the already existing profiles feature.

I've been a user of profiles since Firefox was Netscape.  It took me a minute to realize that the feature isn't toggled on by default.  There's was no mention of the functionality the the 145 release notes.  It can easily be switched on in about:config by toggling the key browser.profiles.enabled from false to true.  This new profiles functionality seems to be separated from current profiles though.  I was hoping that my existing profiles would just be there.  It could be that's coming and part of why the feature is currently toggled off by default.  Will be interesting to see how this matures.

Whatever this is, it's not even slightly new, I've been using separate FF profiles for many years. And TFA literally says "Chrome was first". No it wasn't!

Firefox support literally tells you to "create a new profile" for certain problems, and has suggested that for as long as it's existed.

Nice to see they've added an already existing feature. But everything is as expected, even though FF have had profiles for an eternity it's time to copy Chrome. New feature!

The only thing FF is good for nowadays is to disappoint those who thought they wouldn't be disappointed anymore after switching away from FF.