If this isn't a targetted advert in my browser, I don't know what is.
And here's where you turn it off:
Yeah, I'm not a privacy expert. And I didn't ever think of user.js as privacy protection personally. I use it to turn off AI and other things that annoy me. Privacy-wise I use OBO and few others. The arkenfox settings I used as a basis but I removed anything that wasn't ai related or that I didn't understand.