[ISSUE] Firefox ignores system DNS setting

[ISSUE] Firefox ignores system DNS setting

[DottoDev]

[-- Attachment #1: Type: text/plain, Size: 833 bytes --]

New issue by DottoDev on void-packages repository

https://github.com/void-linux/void-packages/issues/34097

Description:
Firefox should use the system DNS, but Mozilla has an agreement with Cloudflare to force the usage of the Cloudflare DNS Servers.
Possible Change:
add **pref("network.trr.mode", 5);** to _files/vendor.js_

### System

* xuname:  
  Void 5.13.19_1 x86_64 GenuineIntel uptodate rrmFF
* package:  
  firefox-94.0_1 

### Expected behavior
Firefox should use the System DNS

### Actual behavior
Firefox ignores the system settings and uses Cloudflare DNS Server

### Steps to reproduce the behavior
Change the /etc/resolv.conf file to a non Cloudlfare nameserver and do a dns lookup in firefox using a site like www.dnsleaktest.com. It will still show a cloudflare dns server as the DNS Server.

Re: Firefox ignores system DNS setting

[Duncaen]

[-- Attachment #1: Type: text/plain, Size: 432 bytes --]

New comment by Duncaen on void-packages repository

https://github.com/void-linux/void-packages/issues/34097#issuecomment-969192443

Comment:
Users can configure firefox on about:preferences how they like I don't think completely disabling DoH is a good idea, they are not forcing the usage of Cloudflare, they default to it and there is a choice in the settings between Cloudflare, NextDNS, bring your own DoH or not using DoH.
 

Re: Firefox ignores system DNS setting

[Duncaen]

[-- Attachment #1: Type: text/plain, Size: 433 bytes --]

New comment by Duncaen on void-packages repository

https://github.com/void-linux/void-packages/issues/34097#issuecomment-969192443

Comment:
Users can configure firefox on about:preferences how they like. I don't think completely disabling DoH is a good idea, they are not forcing the usage of Cloudflare, they default to it and there is a choice in the settings between Cloudflare, NextDNS, bring your own DoH or not using DoH.
 

Re: Firefox ignores system DNS setting

[DottoDev]

[-- Attachment #1: Type: text/plain, Size: 926 bytes --]

New comment by DottoDev on void-packages repository

https://github.com/void-linux/void-packages/issues/34097#issuecomment-969203392

Comment:
> Users can configure firefox on about:preferences how they like. I don't think completely disabling DoH is a good idea, they are not forcing the usage of Cloudflare, they default to it and there is a choice in the settings between Cloudflare, NextDNS, bring your own DoH or not using DoH.

It has no negative impact turned off because it still defaults to cloudflare but it has a negative impact on the user if he changes the system dns server without checking the dns firefox uses. Also the ignorance of system-level dns settings of firefox is not something many users know about. And isn't DoH still on, as long as the box "Enable DNS over HTTPS" in the settings is checked. This flag should just allow the user to disable DoH by just unchecking the box "Enable DNS over HTTPS"

Re: Firefox ignores system DNS setting

[Duncaen]

[-- Attachment #1: Type: text/plain, Size: 228 bytes --]

New comment by Duncaen on void-packages repository

https://github.com/void-linux/void-packages/issues/34097#issuecomment-969208669

Comment:
This flag disables DoH afaiu and "Enable DNS over HTTPS" can already be unchecked no?

Re: Firefox ignores system DNS setting

[DottoDev]

[-- Attachment #1: Type: text/plain, Size: 184 bytes --]

New comment by DottoDev on void-packages repository

https://github.com/void-linux/void-packages/issues/34097#issuecomment-969229052

Comment:
It can be unchecked but it has no effect

Re: Firefox ignores system DNS setting

[Duncaen]

[-- Attachment #1: Type: text/plain, Size: 186 bytes --]

New comment by Duncaen on void-packages repository

https://github.com/void-linux/void-packages/issues/34097#issuecomment-969236792

Comment:
Do you have anything supporting that claim?

Re: Firefox ignores system DNS setting

[Duncaen]

[-- Attachment #1: Type: text/plain, Size: 215 bytes --]

New comment by Duncaen on void-packages repository

https://github.com/void-linux/void-packages/issues/34097#issuecomment-969236792

Comment:
Do you have anything supporting that claim? Works perfectly fine for me.

Re: Firefox ignores system DNS setting

[DottoDev]

[-- Attachment #1: Type: text/plain, Size: 493 bytes --]

New comment by DottoDev on void-packages repository

https://github.com/void-linux/void-packages/issues/34097#issuecomment-969356807

Comment:
With correct /etc/resolv.conf firefox uses this DNS Servers
Both times with the box "Enable DNS over HTTPS" unchecked
With trr.mode = 2
https://pasteboard.co/cEvSOOMyahLq.png

With trr.mode = 5
https://pasteboard.co/WPvMivdYkg9n.png

The Problem is with the default, 2, Firefox ignores the settings of /etc/resolv.conf which should be used

Re: Firefox ignores system DNS setting

[Duncaen]

[-- Attachment #1: Type: text/plain, Size: 336 bytes --]

New comment by Duncaen on void-packages repository

https://github.com/void-linux/void-packages/issues/34097#issuecomment-969371147

Comment:
I don't see where "2" would be the default. The source defines options "2" and "3" as user defined and the default is "0":
https://searchfox.org/mozilla-central/search?q=network.trr.mode&path=

Re: Firefox ignores system DNS setting

[github-actions]

[-- Attachment #1: Type: text/plain, Size: 293 bytes --]

New comment by github-actions[bot] on void-packages repository

https://github.com/void-linux/void-packages/issues/34097#issuecomment-1153388207

Comment:
Issues become stale 90 days after last activity and are closed 14 days after that.  If this issue is still relevant bump it or assign it.

Re: [ISSUE] [CLOSED] Firefox ignores system DNS setting

[github-actions]

[-- Attachment #1: Type: text/plain, Size: 836 bytes --]

Closed issue by DottoDev on void-packages repository

https://github.com/void-linux/void-packages/issues/34097

Description:
Firefox should use the system DNS, but Mozilla has an agreement with Cloudflare to force the usage of the Cloudflare DNS Servers.
Possible Change:
add **pref("network.trr.mode", 5);** to _files/vendor.js_

### System

* xuname:  
  Void 5.13.19_1 x86_64 GenuineIntel uptodate rrmFF
* package:  
  firefox-94.0_1 

### Expected behavior
Firefox should use the System DNS

### Actual behavior
Firefox ignores the system settings and uses Cloudflare DNS Server

### Steps to reproduce the behavior
Change the /etc/resolv.conf file to a non Cloudlfare nameserver and do a dns lookup in firefox using a site like www.dnsleaktest.com. It will still show a cloudflare dns server as the DNS Server.