Just to clarify, I already use Brave and Vanadium for 99.99℅ of my browsing and don't plan to stop. But, there's a specific extension I like to use for some non-sensitive websites, so I need a browser that supports extensions for that purpose.
It appears that Kiwi browser was officially abandoned earlier this year, but I'm seeing some references to this new Quetta Browser as a worthy successor. I've never heard of it before.
I'm currently using IronFox, but it's extremely slow and it appears to be battery inefficient as well.
I used to use Fennec F-Droid (as a replacement of vanilla Firefox), but it recently started having issues opening up some pages when shared, so I stopped using it. I could go back to vanilla firefox as well, though I was a bit uncomfortable with the extra data collection "features" the last time I installed it.