https://blog.mozilla.org/security/2021/03/23/introducing-smartblock/ Mozilla Menu * Internet Health * Technology * Give Download Firefox Mozilla Security Blog * Search this site [ ] Search Categories: Privacy Firefox 87 introduces SmartBlock for Private Browsing Thomas Wisniewski March 23, 2021 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. SmartBlock ensures that strong privacy protections in Firefox are accompanied by a great web browsing experience. Privacy is hard At Mozilla, we believe that privacy is a fundamental right and that everyone deserves to have their privacy protected while they browse the web. 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. This feature automatically blocks third-party scripts, images, and other content from being loaded from cross-site tracking companies reported by Disconnect. By blocking these tracking components, Firefox Private Browsing windows prevent them from watching you as you browse. 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. This can result in images not appearing, features not working, poor performance, or even the entire page not loading at all. New Feature: SmartBlock To reduce this breakage, Firefox 87 is now introducing a new privacy feature we are calling SmartBlock. SmartBlock intelligently fixes up web pages that are broken by our tracking protections, without compromising user privacy. SmartBlock does this by providing local stand-ins for blocked third-party tracking scripts. These stand-in scripts behave just enough like the original ones to make sure that the website works properly. They allow broken sites relying on the original scripts to load with their functionality intact. The SmartBlock stand-ins are bundled with Firefox: no actual third-party content from the trackers are loaded at all, so there is no chance for them to track you this way. And, of course, the stand-ins themselves do not contain any code that would support tracking functionality. In Firefox 87, SmartBlock will silently stand in for a number of common scripts classified as trackers on the Disconnect Tracking Protection List. Here's an example of a performance improvement: Side by side comparison: before and after SmartBlock. An example of SmartBlock in action. Previously (left), the website tiny.cloud had poor loading performance in Private Browsing windows in Firefox because of an incompatibility with strong Tracking Protection. With SmartBlock (right), the website loads properly again, while you are still fully protected from trackers found on the page. We believe the SmartBlock approach provides the best of both worlds: strong protection of your privacy with a great browsing experience as well. These new protections in Firefox 87 are just the start! Stay tuned for more SmartBlock innovations in upcoming versions of Firefox. The team This work was carried out in a collaboration between the Firefox webcompat and anti-tracking teams, including Thomas Wisniewski, Paul Zuhlcke and Dimi Lee with support from many Mozillians including Johann Hofmann, Rob Wu, Wennie Leung, Mikal Lewis, Tim Huang, Ethan Tseng, Selena Deckelmann, Prangya Basu, Arturo Marmol, Tanvi Vyas, Karl Dubost, Oana Arbuzov, Sergiu Logigan, Cipriani Ciocan, Mike Taylor, Arthur Edelstein, and Steven Englehardt. We also want to acknowledge the NoScript and uBlock Origin teams for helping to pioneer this approach. Browse fast. Browse free. Download Firefox Previous article Firefox 87 trims HTTP Referrers by default to protect user privacy March 22, 2021 More articles in "Privacy" * Firefox 87 trims HTTP Referrers by default to protect user privacy March 22, 2021 * Firefox 85 Cracks Down on Supercookies January 26, 2021 * Firefox 79 includes protections against redirect tracking August 4, 2020 * Multi-Account Containers Add-on Sync Feature February 6, 2020 * Firefox 72 blocks third-party fingerprinting resources January 7, 2020 Recent articles * Firefox 87 trims HTTP Referrers by default to protect user privacy March 22, 2021 * Firefox 86 Introduces Total Cookie Protection February 23, 2021 * Firefox 85 Cracks Down on Supercookies January 26, 2021 * Encrypted Client Hello: the future of ESNI in Firefox January 7, 2021 * Design of the CRLite Infrastructure December 1, 2020 Keep up with all things Firefox. 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