You linked to a bug in Firefox Nightly. That's hardly indicative of there being widespread issues. Also that bug seems to occur when IPv6 is disabled in the ke

You linked to a bug in Firefox Nightly. That's hardly indicative of there being widespread issues. Also that bug seems to occur when IPv6 is disabled in the kernel. Random applications should be fine with trying the IPv6 address, and if it fails using the IPv4 address. That should happen transparently. There are millions of Linux deployments that don't require manually disabling IPv6. You not having an IPv6 address is a separate issue.