I assume you've heard of it, but just in case you haven't: you should try Zen! It's basically Arc, but based on Firefox, open source and, more importantly, actively maintained.
(I need them partly because of Google, as Google has a broken login system. I use GGP at work plus a bunch of work apps that use Google for SSO. But for some products like Maps and YouTube, I use my personal account. Doing that on e.g. Chrome is painful, because every URL opens with whatever is your default login, and whatever I set as the default, it's usually wrong.)
(See also this almost identical conversation: https://phanpy.social/#/fosstodon.org/s/117281195620828803)
I'm the same way. Turn off crypto by default (is it these days?) and that's pretty much it.
I like how they host selected Manifest v2 extensions themselves so uBlock Origin latest continues to work and is actively maintained.
Speed of Chromium with privacy focus. Works for me.
Since Google has proven willing to stoop to bad behavior to lend Chromium the impression of superior performance[0] I don't consider subjective performance to be a meaningful benchmark.
As metrics go, I am more concerned with "demonstrable respect for user-agency", a competition in which a browser from the world's largest advertising conglomerate is forbidden entry.
[0] https://arstechnica.com/gadgets/2014/07/why-google-took-year...
Edit: I also use it as my mobile browser. I really don't see any problems on their mobile app (iOS)