Article 5CVGG Why Firefox wont respect my dns settings but dns utilities (dig, nslookup ) will ?

Why Firefox wont respect my dns settings but dns utilities (dig, nslookup ) will ?

by
chomwitt
from LinuxQuestions.org on (#5CVGG)
In my home lan i've installed a pizero with pihole with
static ip 192.168.1.201

From another host 192.168.1.200 i try:

$ dig youtube.com

Quote:
; <<>> DiG 9.11.3-1ubuntu1.13-Ubuntu <<>> youtube.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 52737
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;youtube.com.INA

;; ANSWER SECTION:
youtube.com.2INA0.0.0.0

;; Query time: 5 msec
;; SERVER: 192.168.1.201#53(192.168.1.201)
;; WHEN: Fri Jan 15 00:02:34 EET 2021
;; MSG SIZE rcvd: 45
But firefox can visit youtube.

How could an application use a different dns resolution procedure?

I have cleared firefox dns cache :
about:networking#dnslatest?d=yIl2AUoC8zA latest?i=TKMYJ-qALE4:Ew5c2va7J0M:F7zBnMy latest?i=TKMYJ-qALE4:Ew5c2va7J0M:V_sGLiP latest?d=qj6IDK7rITs latest?i=TKMYJ-qALE4:Ew5c2va7J0M:gIN9vFwTKMYJ-qALE4
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