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This article is for users who encounter DNS leaks in Mozilla Firefox while connected to ExpressVPN.
DNS leaks occur when a DNS query is made outside the VPN tunnel. Mozilla Firefox’s DNS over HTTPS feature bypasses ExpressVPN’s DNS and runs DNS queries outside the ExpressVPN tunnel. This feature will soon be introduced in Google Chrome.
To disable DNS over HTTPS:
Open your browser Settings or Preferences.
Under Network Settings, click Settings…
Scroll to the bottom and ensure the Enable DNS over HTTPS box is unchecked. Click OK.