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The problem seems to be "wrong domain", not "CA not recognized". You sure you have the right URL?

i'm mobile. probably got the wrong url. only have bookmarks for the ca certs https://www.gov.br/iti/pt-br/assuntos/repositorio/repositori...

But what do you need these certs for, is there a national website that gets an "insecure" warning if you visit it with a foreign version of Firefox?

yeah, the tax preparation website and others.