I think what was being asked is if there's something like Brave that doesn't use a webkit derived back-end. Good defaults and a good stance on privacy is one reason to use Brave and historically Firefox, but another is that it keeps the browser ecosystem from being too homogeneous. Firefox is the last browser with over sub-percent market share, and even then it's less than 3%, so it's almost gone.
A case can be made that many of the browsers split from webkit (or split from things that split from webkit) long enough ago that there is competition, but IMO that's a far cry from a fully independent solution.
I’m kind of addicted to tab containers right now and I have them set up in a way where I can proxy specific containers out different socks proxies that go through different VPN tunnels. Niche I know but it’s keeping me on FF.
its mostly a bunch of stuff i whipped together myself, but the short of it is i have a docker container that acts as a "vpn broker", establishing multiple vpn connections and then exposing access to them over socks proxies, and in the tab containers you can natively assign a socks proxy per container group
there's probably software already out there that does this same thing and probably does it better, id be hesitant to open-source what i have without a lot of cleanup and security changes.
so certain tab container groups go out certain proxies which in turn egress specific vpn tunnels