Safari used to work just fine for prime video, with Microsoft’s Silverlight extension plugin installed. However, Apple updated Safari in such a way the that Silverlight can not be utilized.
The real problem is due to the inability to decode DRM video. Newer mac’s Have Intel’s Quick Sync technology (built into the cpu). Some machines don’t have a Quick Sync enabled CPU (cMP), and require a DRM Management tool in order to decode the video. That tool was Silverlight for the Safari browser, but Apple killed it. Decoding plug-ins will work on Firefox and other browsers that support Silverlight. Firefox is my goto for watching protected streaming services. Apple Safari is the problem. Apple could have let it continue working on machines the don’t have Quick Sync.
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That’s only because YOUR particular machine has Quick Sync enabled CPU.