Around 24th Jan 2020, Firefox introduced support for DNS over HTTPS (DOH), and freebsd decided to stop updating Firefox.
Under benefits section of Firefox they say:
DoH improves privacy by hiding domain name lookups from someone lurking on public WiFi, your ISP, or anyone else on your local network. DoH, when enabled, ensures that your ISP cannot collect and sell personal information related to your browsing behavior.
This is abject hogwash. Here is how Wikipedia puts it:
Technology journalists have argued that DoH provides a false sense of security, as it only encrypts information that could still be obtained via non-encrypted portions of HTTPS requests, such as IP addresses and Server Name Indication.
For HTTP sites DOH provides absolutely no privacy from ISP/network sniffers in your LAN etc. For HTTPS sites, ones that use SNI, it again provides no privacy. Only for non SNI HTTPS sites, it provides domain name privacy, but even there IP is available to ISP etc. And for non SNI HTTPS sites, domain to IP and IP to domain is one to one mapping, so there just knowing what IP you connect to is sufficient to let ISPs know what domain you are accessing.
So in short DOH in Firefox provides very dubious, almost non existent privacy.
Instead, they have added a new privacy infringement vector, the DOH provider, in this case Cloudflare.
In plain words, every single domain you access from Firefox, is going to relayed (along with your IP address) to Cloudflare. This is a major privacy concern.
Let me repeat, this change does not hurt ISPs ability to access this data, this only only provides Cloudflare access to this data, that they did not have before this change.
Doing so, in the name of increasing privacy, that reeks. That reeks Firefox and Cloudflare, and you should be ashamed of yourselves.