How can I stop Firefox from blocking a link I click on?

Episode 1044 (2:18:49)

Morris from Lake Forest, CA

Morris clicked on a link from an email that got sent to him, but Firefox won't let it open. Leo says that's a security feature designed to protect him from being taken over by hackers. Leo says that it's likely that Morris may have gotten lured by a bad email and Firefox saved him from it. Leo says it can be disabled, but it protects him and is for his own good.