I only get this on my endeavorOS install when I use the ALHP x86-64-v3 repo as explained here:

https://somegit.dev/ALHP/ALHP.GO

When I get rid of them it went away so I’ve avoided them for a bit.

If you install fennec from f-droid it’s the same thing as Firefox and provided by Mozilla.

Kernel 5.8 changed this, so the value is from 0 to 200.

https://docs.kernel.org/admin-guide/sysctl/vm.html#swappiness

I was dealing with wire guard dns issues recently. What is the interface set to in settings > DNS? I had to set mine to permit all origins for pihole to play nice with wireguard.