Squoggle

You can have all of your DNS queries that originate from Firefox go over HTTPS instead of a plain text query as would happen in a normal DNS query.

This only applies to Firefox. This is typically called DoH which stands for DNS over HTTPS.

Enable DoH:

Click the Menu button and then click Preferences

Click General on the left side of the screen then scroll down to the bottom of the screen and find Network Settings and click the Settings button.

Check the Enable DNS over HTTPS checkbox

Use the default provider Cloudflare. Then click OK

Your DNS queries that Firefox does will now be redirected to Cloudflare DNS servers and not your local or ISP DNS servers.

Exceptions:

There are certain web applications that don’t seem to work using DoH. They are somehow smart enough to know you are using DoH and don’t want you to. You can add exceptions to the rules to get around this. Make sure that the exceptions to the rules do not negate your reasons to do DoH in the first place.

To add exceptions:

Type about:config into the address bar of Firefox.

In the search bar type network.trr.excluded-domains to find the setting where you can add exclusions.

Double click the setting. You can now add comma separated domains to this list that will be excluded from doing DoH.

Make sure you remember that you have exceptions or you could get in some trouble.