To enable DoH, click on the three horizontal bars in the upper right corner of Firefox and then select the "Options" button. (Click on "Preferences" if you use macOS.)
Locate the "Network Settings" heading and then click the "Settings" button.
Scroll down to "Enable DNS via HTTPS" and check or uncheck the corresponding box to enable or disable the setting.
When you enable DNS via HTTPS in this way, Firefox uses Cloudflare DNS by default. You can change your DNS by using the & # 39; Use Provider drop-down menu & # 39; clicking on & # 39; NextDNS & # 39; to use the alternative chosen by Mozilla or to & # 39; Custom & # 39; to enter your desired DNS server address manually. However, DNS via HTTPS only works if your selected DNS server has enabled support for this. You cannot just use an old DNS server.
Even if you don't manually enable DoH, Firefox will automatically enable it for you in the coming weeks – assuming you are in the US We expect Mozilla to automatically enable DoH for people in other countries in the future as well.