I’m guessing that the IAB feels that since the GOVERNMENT can monitor everything, they need to get in on the action.
In the meantime, in your “Privacy” options, you can turn third-party cookies off manually right now. But the default setting accepts them. . .now.
All Mozilla is doing is changing the default option to “do not accept third-party cookies”. And the advertisers are having hissy fits worthy of Obama himself!!!
A discussion of FF add-ons (Disconnect, DoNotTrack, Ghostery) that block Web trackers is available at Windows Secrets:
https://windowssecrets.com/newsletter/add-ons-that-help-browsers-block-web-trackers/