The unconsented 3rd-party sharing is admittedly scandal-worthy.
As for the rest, IMO the author is tilting at windmills. These days Firefox is a trend-taker not a trend-maker. If the other browsers are metamorphosing into AI agents, then Firefox has no choice but to follow while doing it in the most privacy-respecting way possible. Otherwise Firefox will have no users and we will have no Firefox left to complain about.
To think that "We don't want this AI crap" is a serious business proposition in 2026 - it's deluded IMO. There just aren't enough privacy-obsessed 90s-era geeks left to sustain such a product. We will have to compromise.