About WebBlocker If you give users unlimited website access, your company can suffer lost productivity and reduced bandwidth. Uncontrolled Internet browsing can also increase security risks and legal liability. The WebBlocker security subscription gives you control of the websites that are available to your users. WebBlocker uses a database that groups website addresses into content categories. When a user on your network tries to connect to a website, the Firebox looks up the address in the WebBlocker database and takes the action you specify for the content category. For locally-managed Fireboxes, you can specify the action WebBlocker takes for uncategorized websites.