Version 85 of
the Firefox browser has been released. The headline change appears to
be the isolation of internal caches to defeat the use of “supercookies” to
track users; see this
blog entry for details. “In fact, there are many different
caches trackers can abuse to build supercookies. Firefox 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.“

Source: LWN.net – Firefox 85 released