Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More
Lolu chungechunge lwabekwa kunqolobane. Uyacelwa ubuze umbuzo omusha uma udinga usizo.
Okugcinwe kunqolobane

Firefox Preview DoH DNS?

Firefox for Android Beta Ukugcinwa kwemininingwane iyimfihlo nokuvikeleka
Kevin replied
neil26
neil26

Hello,

Running Firefox Preview 5.1.1 (Build #21571852) I just want to understand the DNS process. If I block a domain via my local DNS resolver, it seems preview can still access the URL. If on the same device I open Chrome and try the same URL it it correctly doesn't connect.

From preview I can see the DNS requests it makes to my local DNS server so I was expecting it to also fail like chrome above. It doesn't seem like there is a DoH resolver built in like on the main Firefox build, but I just can't understand how the request is succeeding.

Thanks!

Hello, Running Firefox Preview 5.1.1 (Build #21571852) I just want to understand the DNS process. If I block a domain via my local DNS resolver, it seems preview can still access the URL. If on the same device I open Chrome and try the same URL it it correctly doesn't connect. From preview I can see the DNS requests it makes to my local DNS server so I was expecting it to also fail like chrome above. It doesn't seem like there is a DoH resolver built in like on the main Firefox build, but I just can't understand how the request is succeeding. Thanks!

All Replies (1)

Kevin
Kevin

Firefox Preview does not support DoH. Firefox should be using the DNS settings from the phone. about:networking may provide some useful information about the network requests you are seeing.