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send.firefox.com says that my browser (Safari) is unsupported. Anyone know what particular "web technology" the site uses that Safari doesn't support?

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This is the only one I can think of, not sure why that site would require it though. https://caniuse.com/#feat=input-file-directory

Found it. It's checking for window.crypto.subtle. Looks like Safari TP supports this. I believe the problem with Safari 10 is that it implemented an older version of the web cryptography standard.

yep

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