The network technologies, DNS and HTTPS, help browsers to thwart snooping and subsequently the tampering of website location by middlemen, by encrypting the connections to the web servers that host websites.
While the Domain Name System (DNS) serves as the phone book for the internet, it converts readable domain names into IP addresses needed to communicate with computers across the network, and thus enable web users to get to their target resources, as often times, popular resources exist in different locations.
HTTPS, on the other hand is the secure version of the Hypertext Transfer Protocol used to fetch data from websites.
Mozilla has commenced a project to thwart network snoopers by encrypting connections to the web servers that host websites, by the combination of the network technology, DND and HTTPS called DoH, to prevent middlemen from figuring out the internet servers Firefox users are trying to reach and from sending the user to a fake version of a website.
Firefox's implementation of DoH would help seal off major holes, as regards privacy and security, though there are technical challenges that aren't going away anytime soon, but gradually things will improve.
The support for DoH has been added to Firefox 62 to improve the way Firefox interacts with DNS, while DoH employs encrypted networking to obtain DNS information from a server that is configured within Firefox.
Firefox, however does not use DoH by default, to use (or not use) DoH simply go through the configuration editor to configure it. Also, if you want to test DoH outside of a shield study, the support works best in Firefox 62 or newer and Shield studies will not override your manual configuration.
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