On Windows apparently this can be achieved for google searches by creating a new CNAME record on your local DNS server for your local Google domain(s) pointing to forcesafesearch.google.com (although its unconfirmed as to whether this method works or is any better than simply editing your hosts file, which is also present on windows and works the same) But I would like to know if its possible to enforce safe search across all search engines using Ubuntu Desktop 18.04 LTS?