Why doesn't web inspector (Chrome, Firefox) show everything?

Question

Google Chrome

tools.pingdom.com/fpt/#!/c53ZS0/avaho.ru there
is some request dmg.digitaltarget.ru (below)
c2n.me/3qc3LN5.png
apparently, this is an office https://amberdata.ru/ #partners , i.e. the feeling that Adriver, which is used on the site to unroll banners, still loads all this retargeting dregs from Amberdata
But neither Chrome nor Firefox show this.
Why?
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UPD: disabled through a request in Adriver

Answer 1

In my Google console on the Bitrix site, this syphilitic garbage also got out from somewhere.
I remembered ... Well, I screwed myself with the sharing buttons.
That's where the pain comes from, apparently.