https://techdocs.akamai.com/etp/docs/disable-doh-browsers

DoH is enabled by default on Google Chrome version 83 or later. Complete this procedure to disable DoH.

To disable DoH on Chrome:

1. In the Chrome address bar, enter chrome:flags/#dns-over-https. - Go to the Secure DNS lookups setting. - In the provided menu, select Disabled. - Click Relaunch to relaunch the browser window with this change ===== Mozilla Firefox ===== DoH is enabled by default on Mozilla Firefox. Complete this procedure to disable DoH. To disable DoH on Firefox: - On Mozilla Firefox, click the menu button. - Click Options. - Go to the Network Settings section and click Settings. - Scroll down to the Enable DNS over HTTPS option, and deselect it. - Click OK to save your settings ===== Microsoft Edge ===== While DoH is not enabled by default on Microsoft Edge browsers, you can perform this procedure in case it's enabled. To disable DoH on Edge: - In the Microsoft Edge address bar, enter edge:flags#dns-over-https.
2. Go to the Secure DNS Lookup setting.
3. In the provided menu, select Disabled.
4. Click Restart to restart the browser with this change.