Mozilla announces a new version of SmartBlock, our advanced tracker blocking mechanism built into Firefox Private Browsing and Strict Mode. SmartBlock 2.0 combines a great web browsing experience with robust privacy protection, by ensuring that you can still use third-party Facebook login buttons to sign in to websites, while providing strong defenses against cross-site tracking. Mozilla: We believe that privacy is a fundamental right. We are continuously working to expand SmartBlocks capabilities to give you an even better experience on the web.”]
Source: https://blog.mozilla.org/security/2021/07/13/smartblock-v2/