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Cuireadh an snáithe seo sa chartlann. Cuir ceist nua má tá cabhair uait.

unsupported operating system for prime video

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I have always watched prime video on my computer until just recently . Now I get unsupported operating system. Prime Video titles can't be watched on this device because the operating system isn't supported. For more information, please see Prime Video system requirements

Yet if I go to edge it plays just fine. I have the it set for never remember history and cookies deleted upon closing firefox

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Windows Vista (eof) might be the issue.

Do you have enabled "Resist Fingerprinting" if you check ‘’’Resist Fingerprinting’’’ on the ‘’’about:config’’’ page as this affects the user agent?

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Check that you do not run Firefox in compatibility mode. You can open the Properties of the Firefox desktop shortcut via the right-click context menu and check the "Compatibility" tab. Make sure that all items are deselected in the "Compatibility" tab of the Properties window.