What is ECH?
LibreWolf
Welcome to the official community for LibreWolf.
LibreWolf is designed to increase protection against tracking and fingerprinting techniques, while also including a few security improvements. LibreWolf also aims to remove all the telemetry, data collection and annoyances, as well as disabling anti-freedom features like DRM. If you have any question please visit our FAQ first: https://librewolf.net/docs/faq/
To learn more or to download the browser visit the website: https://librewolf.net/
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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.
What is ECH and GPC?
ECH: Encrypted Client Hello
GPC: Global Privacy Control
I don't really understand these specs on a deep level, so I can't summarize them for you, but these articles should be able to answer any questions you have: