Up until now, these caches were set to share files, and it makes sense from a performance point of view. Instead of having to download files such as fonts for each site, the browser could simply load it from the cache if the file had been downloaded from another site in the past. Sites could use the information to determine if a user visited another site in the past.Starting in Firefox 85, Firefox will partition network resources to eliminate this form of tracking and probing.Google introduced support for partitioning the HTTP cache in Chrome 86 stable to prevent snooping and improve security at the same time.
Performance may be impacted as it is no longer possible to share resources, e.g. the same font. The browser needs to download the file for each top-level domain separately and that takes longer than loading it from cache. The performance impact depends largely on the sites that are visited; if none use the same resources, then no performance hit should be observed when loading sites.Firefox users who are interested in the feature's development can check out the Meta Bug on the Bugzilla website. Firefox 85 is scheduled to be released on January 26, 2021.
Closing WordsNetwork partitioning improves a browser's tracking protection by separating the caches that sites may use when they are accessed in the browser. It is a welcome feature, and it appears to be supported by all modern web browsers that are based on Chromium and Firefox. (via ZDNet)
Firefox 85 will improve privacy with network partitioning feature
Next month's stable release of Firefox 85 will include the anti-tracking feature networking partitioning to improve user privacy on the Internet.
PublisherGhacks Technology News