Not really open source, but want to mention it anyways. Take a look at the Norwegian browser Vivaldi. I made the switch recently and am really happy with it. Their privacy policy seems good, and they have a clear no AI stance. Their android browser is by far the best android browser from a UX standpoint in my opinion.

I might be biased as a Norwegian 😉

I think the reason is that every time they post something, someone there points out the Andy Yen thing. Thats basically the only comments. So its detrimental to their business.