DoH with Firefox

[seefore]

Simon, you were correct above.

Peter, The below settings are working. You must configure this via about:config in the address bar vs preferences > network > setttings:

Clean Browsing Family Filter Settings:

network.trr.bootstrapAddress:    185.228.168.168
network.trr.custom_uri:    https://doh.cleanbrowsing.org/doh/family-filter/
network.trr.mode:    3
network.trr.uri:    https://doh.cleanbrowsing.org/doh/family-filter/

Clean Browsing Adult Filter Settings:

network.trr.bootstrapAddress:    185.228.168.10
network.trr.custom_uri:    https://doh.cleanbrowsing.org/doh/adult-filter/
network.trr.mode:    3
network.trr.uri:    https://doh.cleanbrowsing.org/doh/adult-filter/

[Peter]

Ok thank you, now it seems to be working!

Would be great if CleanBrowsing is integrated into Firefox by default, just like Cloudflare and NextDNS.
But Mozilla seems to be a bit too restrictive at the moment in terms of adding new DNS providers…