WARP client on Linux not HTTP/3 enabled

Description
The Cloudflare WARP client for Linux (warp-cli) does not appear to connect via HTTP/3 when warp is enabled and browsing via Firefox. For some reason, this is not the case for Chromium based browsers (96.0.4664.45).

Steps to reproduce

  1. Set mode to warp in warp-cli via warp-cli set-mode warp
  2. Open Firefox (94.0.2)
  3. Set network.http.http3.enabled to true in about:config
  4. Access https://cloudflare-quic.com/

Result
“When loading this page from Cloudflare’s edge network, your browser used HTTP/2

Expected Result
"When loading this page from Cloudflare’s edge network, your browser used HTTP/3 "

Browser name and version
Firefox 94.0.2 (64-bit)
Chromium 96.0.4664.45 (Official Build) (64-bit)

Operating system
Manjaro Linux x86_64

warp-cli version
WARP 2021.10.0

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