Em outra pergunta, me disseram para fazer uma das duas coisas:
You basically have two options here:
Trust your internet provider and digital reflection to snoop on you “responsibly” without exposing you to security risks. In that case you can ask Firefox to trust their certificate authority for all secured connections. It's possible to apply this trust system-wide.
Don't trust them and ask them to stop snooping on you or find a way around their connection interception with a VPN or equivalent.
Como faço isso no Firefox e no Vivaldi 32 bits?