At the moment, QUIC (HTTP/3) proxy scheme is not supported in Firefox. Chrome already supports QUIC proxy [scheme](https://developer.chrome.com/docs/extensions/reference/api/proxy#type-Scheme). See also: https://searchfox.org/mozilla-central/rev/1aaacaeb4fa3aca6837ecc157e43e947229ba8ce/netwerk/protocol/http/HttpBaseChannel.cpp#6229 https://searchfox.org/mozilla-central/source/toolkit/components/extensions/ProxyChannelFilter.sys.mjs#43
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At the moment, QUIC (HTTP/3) proxy scheme is not supported in Firefox. Chrome already supports QUIC proxy [scheme](https://developer.chrome.com/docs/extensions/reference/api/proxy#type-Scheme) i.e. "http", "https", "quic", "socks4", "socks5". See also: https://searchfox.org/mozilla-central/rev/1aaacaeb4fa3aca6837ecc157e43e947229ba8ce/netwerk/protocol/http/HttpBaseChannel.cpp#6229 https://searchfox.org/mozilla-central/source/toolkit/components/extensions/ProxyChannelFilter.sys.mjs#43 [Chromium: QUIC proxy scheme](https://chromium.googlesource.com/chromium/src/+/HEAD/net/docs/proxy.md#quic-proxy-scheme)