AFAIK that would mean ChatGPT and each website (not Firefox) would decide that itself. Firefox doesn’t do it since a website may need it.
It wouldn’t need to be proprietary. The logic could just be “remove everything”. Not sure how the Google Inc thing appeared.
That whole post they didn’t even have one sentence that clearly states what theyre doing. I assume it’s “now we’ll make Ecosia one of the default choices”.