Most prominent thing is chat in sidebar. It's iframe + a few shortcuts. Optional, harmless, using zero resources. Actually quite convenient.
Another is perplexity being one of the search providers. This is literally config not code. I wonder how many people actually removed or even looked at the list of the default search providers before that.
I think only real one is ml naming for tabs. Just meh.
Honestly people who deny any usefulness of AI are getting dangerously close to flat-earthers by now.