Blocks like those are only one of the many, many security measures modern browsers have in place to keep you safe online. Browsers Block Malicious Websites Before They LoadIn the early days of the internet, browsers like Netscape Navigator and Internet Explorer only had minimal, if any, security features. In the early days of the internet, browsers had to be updated with a physical medium, like a floppy disk or CD. Modern browsers are built to “prefer” HTTPS connections so they automatically redirect the URL to HTTPS. Those are only some of the ways modern browsers keep us safe online.