No. It adds very little to overall security. It is well-known that phishing sites are taken down within hours of first going up. So there is a large likelihood that a user will end up on a phishing page that will never be reported so that it can be detected. Same applies to malware-serving URLs.To be honest even adblocker blocking the pesky ads from google, lefting only ' trusted ' searches left are alone saving lifes. And when phishing/ malware protection extension is added its huge extra layer of security there
Ad blocker is a whole lot more relevant than malicious URL blocking.