Lots of browsers are mentioned in this thread, before clicking each one it might be nice to know a few things like whether it's open source and how development is sustained.

In a discussion of privacy preserving browsers, open source can be assumed. The only task is to out those that are not for some reason.

Here is the about page:

* https://iridiumbrowser.de/about

It's Chromium without Google integration, too.

I don't see a reason to trust anything without a track record when it comes to a browser.

It seems to be a similar project. I encountered it as one of the best browsers currently running on OpenBSD. In particular it doesn't slowly leak memory over a period of weeks and get really slow like Firefox does on that platform[1].

[1] In fairness, Firefox slowly leaks memory on Linux as well, but it never gets entirely unusable, just mostly.