gecko-dev/testing/web-platform/meta/webrtc/RTCCertificate-postMessage.html.ini

[RTCCertificate-postMessage.html]
  [Check cross-origin created RTCCertificate]
    expected: FAIL

  [Check cross-origin RTCCertificate serialization]
    expected: FAIL

  [Check same-origin RTCCertificate serialization]
    expected: FAIL