Seconded! I started using this a few weeks ago after finding out about it on HN and it has been excellent. There's a small 1-2s delay while it loads and sanitizes the results but I got used to that pretty quickly.

The one downside for me is that iOS Safari doesn't support custom search providers, so I can't use it on my phone unless I switch to an alternate browser. That said, once iOS 14 lands I can set Firefox as my default browser and use it that way.