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Firefox on Windows 11 DoH disabling

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  • Last reply by mulrich

mulrich
mulrich
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Hello, recently I have done in-place upgrade of windows 10 to 11. From that time loading of some pages in Firefox was very slow. For example www.google.com was loaded for about 90seconds. But next loading of the same page before Firefox restart was fast. So I had suspicion to Dns. But when I disabled DoH (Dns over HTTPs) nothing changed. What helped was to set the problematic page to DoH exceptions. So seems, that disabling of DoH is not really disabling, minimally on Windows 11. For sure during troubleshooting I tried it with disabled extensions, new profile, ... But nothing worked. Is there any other way how to disable DoH completely in Firefox? Setting network.trr.mode checked and was set to 5, which should be disabling.

Hello, recently I have done in-place upgrade of windows 10 to 11. From that time loading of some pages in Firefox was very slow. For example www.google.com was loaded for about 90seconds. But next loading of the same page before Firefox restart was fast. So I had suspicion to Dns. But when I disabled DoH (Dns over HTTPs) nothing changed. What helped was to set the problematic page to DoH exceptions. So seems, that disabling of DoH is not really disabling, minimally on Windows 11. For sure during troubleshooting I tried it with disabled extensions, new profile, ... But nothing worked. Is there any other way how to disable DoH completely in Firefox? Setting network.trr.mode checked and was set to 5, which should be disabling.

Chosen solution

Ok. So fixed by disabling http3 (network.http.http3.enable). Seems that it somehow requires/activating DoH or vice versa.

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mulrich
mulrich Question owner
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Any idea? As it is in described state I have to sometimes add new sites to DoH exceptions. What is very strange is, that this slowness (of first site loading) happens for some sites only. And that described DoH disabling doesn't work. The only thing which works is to add them to DoH exceptions. In the meantime I was looking for some other functionalities, which could require DoH. I tried disable Encrypted Client Helo (as it requires DoH), but no change. So any idea how to disable DoH completely?

Helpful?

mulrich
mulrich Question owner
more options

Chosen Solution

Ok. So fixed by disabling http3 (network.http.http3.enable). Seems that it somehow requires/activating DoH or vice versa.

Helpful?

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