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Mozilla Firefox Adds AI-Powered RTX Video
(blogs.nvidia.com)
A place to discuss the news and latest developments on the open-source browser Firefox
Safari is also just one of the forks of the KHTML/WebKit/Blink codebase Chrome is based on. Admittedly they probably implement some of the stuff they do implement themselves too because the common ancestor version is quite a long time ago now.
They don't incorporate chromium changes in safari, so it should be considered separate.