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.