[GlitchRider47]

Hamburger menu > more tools > add new profile

Once you have more than one profile, you'll see the switcher in the top right.

Also, turn off all crypto/ai stuff in settings. I did and I never see it.

It's really not that much.

[zelphirkalt]

I just start Librewolf with -P and keep profiles in separate windows. Easy, already fully supported, and allows things like different themes to highlight the fact I am using different profiles.