Google Explorer doesn't automatically block malicious windows, but it has some built-in security measures and features that help users defend against malicious websites and attacks. For example, Google Browses would use the Domain Name Pollution technique to forward user browsing requests to Google's servers to ensure that the websites visited were safe. In addition, Google Browses also supported the Hades protocol to ensure that the user's data transmission was encrypted to protect the user's privacy and security.