If this isn't a targetted advert in my browser, I don't know what is.
And here's where you turn it off:
I would pay for Firefox if they kept updates like that off by default. Maybe they could have a screen that shows new options you can turn on which I'd happily ignore most of the time. It obviously takes tons of time to build a web browser so I expect it to get paid for somehow, but yeah, the on-by-default enshittification is no good.