Since it's a browser extension, it does not offer any protection outside the browser. If you use a DNS service with malware blocking it will, in theory, "protect" any DNS lookup your system performs. Including lookups that originate from software other than your web browser.
It also differs by using several different services to check all URLs (there's a list in the readme). If you set your DNS to Cloudflare and/or Quad9 you will only get protection from one of those.
I can think of pros and cons with both of these aspects.
Since it's a browser extension, it does not offer any protection outside the browser. If you use a DNS service with malware blocking it will, in theory, "protect" any DNS lookup your system performs. Including lookups that originate from software other than your web browser.
It also differs by using several different services to check all URLs (there's a list in the readme). If you set your DNS to Cloudflare and/or Quad9 you will only get protection from one of those.
I can think of pros and cons with both of these aspects.