Poll: Do you use browser profiles?

Firefox is adding better profile UX (it’s currently behind a flag), but it also supports ‘container tabs,’ which can get you halfway there. Chrome, Safari, and Arc (and other Chromium-based browsers) support profiles natively as ‘first-class citizens.’

As someone who recently switched from Chrome → Arc → Firefox, and literally cannot live without browser profiles, I’m curious about how others use their browsers.