I use firefox for three things.

1. The ad blocker. 2. The sense of superiority over the normies (because of the ad blocker) 3. Theming

If adblockers are killed, that removed points 1 and 2. I am pretty sure I can do the same theming in Chrome (I have simple tastes) so that makes 3 a non-factor. And combined with the companies that refuse to make their sites work with firefox, there is no reason not to use chrome. Privacy is a non-factor since my identity is already wholly linked to my google account. I would have to first switch off off there and I am not putting in the effort for that.