1867562 - Despite the fact that DNS over HTTPS is switched off on Privacy and Security bar in Settings it still leaks my DNS.

Status: RESOLVED INCOMPLETE

(Core :: Networking: DNS, defect)

Description

[lgedminui]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:120.0) Gecko/20100101 Firefox/120.0

Steps to reproduce:

Mozilla Firefox 120.0.1 (64-bit) on macOS Sonoma: Despite the fact that DNS over HTTPS is switched off on Privacy and Security bar in Settings it still leaks my DNS. It won't use my own DNS servers despite restart or setting the browser. Mozilla Firefox is the only browser with such a fault, Your DNS providers are less reliable than systems or ISPs default DNS provider, the user needs to be able to control that.

Actual results:

NOTHING. Despite the switching off DNS over HTTPS.

Expected results:

The browser should use the systems or ISP's default DNS provider.

Comment 1

[edgul]

Thanks for the report.
Some logs may be helpful here. Could you please use about:logging with logging to a file selected to generate a log file and run the steps to reproduce: DoH disable and webrequest. The log file can be emailed to [e-mail].

Comment 2

[Kershaw Chang [:kershaw]]

Please see comment #1.

Comment 3

[edgul]

Set at S3, until we can confirm this is an issue. At which point we will relabel as S2.

Comment 4

[Kershaw Chang [:kershaw]]

Please also test this with a fresh profile and see if you can still reproduce this.
Thanks.

Comment 5

[Kershaw Chang [:kershaw]]

Close as INCOMPLETE since we don't have enough information to debug.