Just because it's there and it's free, doesn't mean you should be using it.
Domain Name Servers, or DNS for short, are basically the backbone to the internet as we know it. Without DNS servers, human interaction with the internet would be extremely difficult.
Watch out Firefox and Chrome, there's a new kid on the block and Vivaldi may shake things up a bit. Vivaldi is still being developed and it's still a little buggy. However Vivaldi is snappy and fast.