[mediasource-config-change-mp4-av-video-bitrate.html]
  prefs: [media.mediasource.enabled:true]
  disabled:
    if (os == "win") and (version == "5.1.2600"): https://bugzilla.mozilla.org/show_bug.cgi?id=1188806
  [Tests mp4 video bitrate changes in multiplexed content.]
    expected:
      if (os == "win") and (version == "5.1.2600"): FAIL