To further protect users from connection-based tracking, Firefox 85 also partitions pooled connections, prefetch connections, preconnect connections, speculative connections, and TLS session identifiers.” This will “greatly reduce the effectiveness” of cache-based supercookies by stopping a tracker from using them across websites, adds Mozilla.įirefox 85 partitions all of the following caches by the top-level site being visited: HTTP cache, image cache, favicon cache, HSTS cache, OCSP cache, style sheet cache, font cache, DNS cache, HTTP Authentication cache, Alt-Svc cache, and TLS certificate cache. The latest update to the Mozilla browser will therefore now partition network connections and caches, isolating them to the website they were created on. Read more of the latest browser security news “This makes it nearly impossible for users to protect their privacy as they browse the web,” says Mozilla in a blog post. However, supercookies are much more difficult to delete and block. Like ordinary cookies, supercookies are small pieces of data stored on a computer by a web browser that can track a user’s internet footprint and remember information such as payment details or items in a shopping basket.

Updates to Mozilla browser include protections against hard-to-block cross-site trackersįirefox 85 has cracked down on so-called ‘supercookies’ by introducing cache partitioning that blocks cross-site tracking.

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