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I am sure it will be easy to opt-out, either by going to the Preferences panel or by an obscure about:config option.

That's the point, it's 'easy' for those who care, but 99% won't be able to change it easily...

If the only ones who don't know how to change it are the ones who don't care, what does it matter?

Only caring for yourself isn't helping your others in a global society, ever.

Our world is full of adverts, most people aren't even going to blink if a couple more appear somewhere.