SafeBrowse от Richard Kabanda

SafeBrowse is a security-focused Firefox extension that protects users from malicious, phishing, and scam websites.

How SafeBrowse works:
Intercepts links before the page loads
Checks domains against live threat intelligence
Instantly blocks dangerous pages with a clear warning
Lets you override or allow trusted sites

When a user navigates to a website, SafeBrowse checks the destination against trusted threat intelligence sources and DNS-based security intelligence, via a secure server-side service.

No personal data is collected or stored by the extension. Website checks are performed anonymously, and all threat analysis is handled externally to keep the browser extension lightweight and privacy-respecting.