TIL. I wish I knew years ago, I've never been happier to have switched.

Still using Chrome for work stuff, since profile management in FF is still pure hate.

what's wrong with `firefox -ProfileManager` and the like or alternatively containers?

I always seem to end up with duplicate profiles, or `about:profiles` refuses to open ("Another copy of Firefox has made changes to profiles.") and on and on with various hiccups and speedbumps. Small annoyances, but profiles on Chrome always Just Work, and the half-dozen times I tried it on FF was always death by a thousand cuts.

It's been a few years, so I'll give profiles another try I guess. Containers likely won't do it since multiple profiles all use the same domain (console.aws.amazon.com being the obvious one).

Containers don't need to auto-open domains. You can simply use them to "color" tabs manually. That should cover your needs!