FireFox v73’s “DOH” by default rollout can help improve & and privacy while browsing

Firefox continues push to bring DNS over HTTPS by default for US users


Today, Mozilla is flipping on the switch to turn on encrypted DNS over HTTPS for U.S. users by default. If you’re unfamiliar with the tech, the pitch is this feature will help prevent internet service providers from tracking the sites you go to.

DNS over HTTPS (DoH) is meant to address the inherent privacy vulnerabilities in how you surf the web. The Domain Name Service (DNS) is, in Mozilla’s words, “one of the oldest parts of internet architecture” and one that hasn’t seen a lot of changes in the past 30 years. This plays into tracking because when you go to a URL, your browser needs to look up the site’s corresponding IP address. It does that via the DNS. But, even if the site you’re visiting is encrypted via HTTPS, the DNS lookup is done over plain text. That means ISPs—or other entities—can, if they so choose, easily figure out what websites you’ve gone to and build up a profile of your browsing habits. DoH is meant to circumvent that by ensuring the DNS lookup is also encrypted. It won’t necessarily stop tracking wholesale, but it will make it more difficult.