Changing your firewall settings isn't something you do inside Google Chrome itself. Chrome doesn't have its own built-in firewall; instead, it relies on your computer's operating system (Windows, macOS, or Linux) and any third-party security software you're using.

Leo didn’t need to change anything in Chrome. He needed to tell his computer’s firewall to trust Chrome again.

Then he remembered: yesterday, he’d installed a new antivirus suite that included a strict firewall. The firewall was blocking Chrome from reaching certain websites, thinking they were risky.