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Amazon Prime Video: "Mozilla FIrefox update required"

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Firefox 90.0.02 64-bit: error from Amazon Prime Video: "Mozilla FIrefox update required."

Firefox 90.0.02 64-bit: error from Amazon Prime Video: "Mozilla FIrefox update required."
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Websites say that Firefox is outdated or incompatible even though it's the latest version

https://support.mozilla.org/en-US/kb/how-reset-default-user-agent-firefox

You can check out at the browserspy website how websites see you:

http://browserspy.dk/browser.php
http://browserspy.dk/headers.php