That they would even consider such a new technology as a “threat” is a laughable matter, and that they invoke children (i.e. by referencing content blockers) is

That they would even consider such a new technology as a “threat” is a laughable matter, and that they invoke children (i.e. by referencing content blockers) is pure alarmism. That DoH obsfucates DNS logs from the ISP is probably another red flag to their desire to collect data. The problem lies in the fact that Firefox is a browser, not an OS, and that a savvy kid could bypass local DNS filters by configuring Firefox. But even if locked out of OS settings they could enable a web proxy or use a free whois tool and hope for http. Or, even easier: they could use public wifi. While it would be nice for Firefox to add a child lock for this to appease ISPA, the Internet is interconnected and impossible to divide into sections. Technology is not a solution for social problems, and thus is a terrible replacement for a parent.