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How do I enable Secure SNI

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'''I did a check at [http://example.com https://www.cloudflare.com/ssl/encrypted-sni/] '''
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You should contact their support on how to do this setup. Firefox doesn't control how cloudflare setups their secure connections.

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Firefox does support echConfig, but your current DNS service may not support it.

Do you have enabled DNS over HTTPS ?

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