To reduce this breakage, Firefox 87 is now introducing a new privacy feature we are calling SmartBlock. This can result in images not appearing, features not working, poor performance, or even the entire page not loading at all.

In building these extra-strong privacy protections in Private Browsing windows and Strict Mode, we have been confronted with a fundamental problem: introducing a policy that outright blocks trackers on the web inevitably risks blocking components that are essential for some websites to function properly. By blocking these tracking components, Firefox Private Browsing windows prevent them from watching you as you browse. This feature automatically blocks third-party scripts, images, and other content from being loaded from cross-site tracking companies reported by Disconnect. Since 2015, as part of the effort to provide a strong privacy option, Firefox has included the built-in Content Blocking feature that operates in Private Browsing windows and Strict Tracking Protection Mode. Privacy is hardĪt Mozilla, we believe that privacy is a fundamental right and that everyone deserves to have their privacy protected while they browse the web.

SmartBlock ensures that strong privacy protections in Firefox are accompanied by a great web browsing experience. Today, with the launch of Firefox 87, we are excited to introduce SmartBlock, a new intelligent tracker blocking mechanism for Firefox Private Browsing and Strict Mode.

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