Serious question: Does anyone know of a browser that is NOT a derivative or fork of either Chrome (Chromium) or Firefox?

I realize Microsoft Edge and Opera exist, but I refuse to use those for other reasons, mostly privacy related. Brave and all the others are derivative of Chromium (which is still Chrome/Google).

I read recently (though the article seems to have been buried/removed now) that even though Chromium is fully open sourced, very few people had actually reviewed all the code. As I recall, it turns out there is still google tracking code built into the Chromium core, which is why I say it is still Google.

I realize my claim is a bit unsubstantiated here, and if I can find the article again, I will certainly follow up by posting it.

To summarize, supposing that it's no longer safe (from a privacy and censorship perspective) to use anything based on Chromium or Firefox, and that other more "commercial" browsers (like Opera and Edge) are out, what other options are there?

I think what I'm getting at, is that there is essentially a browser monopoly as well. I remember 20-25 years ago, when it seemed like everyone was trying to make a better web browser so there were literally hundreds to choose from. Many of them did not share the same codebase, so you really were getting a unique implementation each time.

Sorry for the wall of text/rant, but I'm curious as to opinions or suggestions for alternate browsers.