[Taskcluster] Run Py3 infrastructure/ tests on Firefox as well as Chrome #27104
Two tests fail in
Running one locally I see:
@jgraham - I'm not really sure what's going on here; I assume some Py3 bug in the websocket-over-http2 code, but I don't know where to start digging in.
Test passes in Firefox on Py2.
Test fails instantly in Chrome on Py2 or Py3 due to