Your browser can still be fingerprinted without cookies. The site just needs enough unique information (user agent, timezone, screen size, IP, operating system, country, etc.) to form a trackable identity.

> IP

This is a surprisingly effective one when combined with other users of your network. A couple of years ago, I started getting Facebook ads for things I'd never looked at, but that I knew my wife had looked at. We don't share any devices, and she doesn't even have a Facebook account.

It's pretty troubling how invasive shadow profiles are.

What I'd like is a Mullvad container in regular Firefox so I can choose what sites to open in it, or rather make it the default and move a site to another container if I want permanent cookies. I use temporary containers now but the extra fingerprinting features appeal to me.

You could look into Mozilla's VPN offering, it does what you want and is powered by Mullvad.

It’s a neat feature, but beware: Per-container VPN reveals your real IP if you‘re also using uBlock in the default configuration at the moment due to a limitation in Firefox: https://github.com/gorhill/uBlock/wiki/Dashboard:-Settings#u...