It’s been here since more than a year. https://blog.mozilla.org/en/mozilla/firefox-androids-new-privacy-feature-total-cookie-protection-stops-companies-from-keeping-tabs-on-your-moves/

It’s there on mobile. Check the details tab in tracking protection. You should see it mentioned there.

Is there a non paywalled article somewhere? It asks for a sub the alternative asks for sign up and free trial.

Firefox could get litigated for ad fraud and these trusted 3rd parties could block firefox from accessing the sites. It won’t work.

That may be true on desktop. But, unfortunately, the mobile app is way behind chromium. From being unresponsive, to outright buggy. It’s not a good experince. It’s been 2 years since the rewrite but it’s not getting much better or even close to fixing most of its issue. Meaning, using firefox on android is a handicap on yourself.