Firefox enable DNS-over-HTTPS (DoH)


Firefox with DNS-over-HTTPS: In June, the Mozilla Foundation announced that it is investigating the addition of DNS-over-HTTPS (or DoH) functionality to Firefox at a limited level (for Nightly users).

This feature uses the Cloudflare DNS service to encrypt both requests and responses to any DNS queries to increase the privacy of application users.

The Mozilla Foundation has so far been very happy with DoH's performance and said that even the slowest links have made tremendous performance improvements. So Mozilla extends the mood to allow more users to test the DNS-over-HTTPS feature.

"Our initial DoH tests looked at the time it takes to get a response from Cloudflare's DoH resolve," says Mozilla.

"The results were very positive, and the slower users show a huge improvement in performance. A recent test in the Beta channel confirmed that DoH is fast and does not cause problems for our users. "

So if you want to try the new feature, we'll see below how to enable it in your Firefox.

How to enable DNS-over-HTTPS (DoH) in Firefox

DoH is currently being tested, but if you want to use it right away, you can do it by setting it to about: config.

To enable DoH, follow these steps:

Type about: config in the Firefox address bar and press enter. Click the button indicating that you accept the risks.
In the search box, type network.trr to display all settings for Firefox's Trusted Recursive Resolver.
Double-click network.trr.mode, and type 2 in the box. Press OK as shown below. This will trigger DoH in Firefox.

firefox

Then you need to make sure that network.trr.uri is set to https://mozilla.cloudflare-dns.com/dns-query as it is the Cloudflare DoH DNS resolver used by Firefox for testing. If this URL is not set, double-click the setting and enter the URL.
Now you can close the page about: config.

To check if you are using DoH for DNS queries, visit the page Cloudflare Browsing Security Control and click the "Check my browser" button.

The site will perform various tests to determine if you are using Secure DNS, DNSSEC, TLS 1.3, or encrypted SNI.

If the DoH is properly enabled, it should indicate that Secure DNS and TLS 1.3 are enabled as shown below.

So your Firefox will use DoH to resolve the browser's DNS queries.

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