I thought Mozilla was the one behind ECH. How is it enabled in Chrome, Edge, and Opera and not in Librewolf, let alone Firefox?
Is this a false negative from https://privacytests.org?
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IIRC, Mozilla doesn’t ship Firefox with DNS-over-HTTPS (DoH) enabled by default in most countries – and I think it only does Encrypted Client Hello (ECH) if DoH is enabled.
From LibreWolf’s website:
By default DoH is not enabled in LibreWolf.
I assume that also disables ECH by default.