The defaults are too strict. Removing them removes a lot of things and is counter productive in terms of fingerprinting.

• Some sites won't work at all due to the anti-fingerprinting stuff that's enabled on it.
• Everything will be forced to light mode too because of it. Sometimes websites will render at the wrong size.
• DRM content won't play.

I'm using Zen currently, because it at least strips out the telemetry that Firefox has while still being a normal browser.

It's aggressively privacy-first in some ways. It doesn't do any self-updating which could be considered phoning home, so you have to make sure you have a way to keep it updated, through a package manager or otherwise. There's a separate update monitor if you want that, for Windows at least. I tend to dial back the anti-fingerprinting a bit because it just makes browsing frustrating to me. I understand the risk of fingerprinting, and it's good that they do everything they can to avoid being fingerprinted, but it doesn't strike the right balance for me. Particularly forcing light mode, I absolutely fucking loathe getting light blasted unexpected into my eyeballs, I always have. The biggest mistake technology ever made in my opinion was trying to pretend an actively illuminated screen was paper and make it blinding white.

I've so far resisted the urge to enable DRM. If something won't show me stuff without DRM I'm willing to just say I don't want to watch it.

And obviously as per the topic, I turn on sync, which is not on by default, but that's easy and a sensible default. Honestly it's mostly sensible defaults.