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Firefox 86.0 Released With Total Cookie Protection, Stack Clash Protection
Firefox 86.0 introduces "Total Cookie Protection" in strict mode where every website is then bound to its own "cookie jar" to better prevent sites from tracking users site-to-site. Firefox on Linux and Android also now mitigates against stack clash attacks. DTLS 1.0 support has also been dropped from WebRTC PeerConnections support.
Firefox 86.0 also enables support for simultaneously watching multiple videos in Picture-in-Picture mode, improved print functionality / UI design, and performance/stability improvements for canvas drawing and WebGL drawing to the GPU process.
More details on these changes and other alterations with Firefox 86 can be found at Mozilla.org.