How to debug video playback issues on Firefox for Android

• brew install android-platform-tools
• adb shell am start -a android.activity.MAIN -n org.mozilla.fennec/.App --es env0 NSPR_LOG_MODULES=MediaDecoder:5
• adb logcat gecko
• supporting material:
• https://wiki.mozilla.org/Mobile/Fennec/Android
  "Arguments and Environment Variables "
  --es env# VAR=VAL
  where VAR=NSPR_LOG_MODULES=MediaDecoder:5 (the string "MediaDecoder" was found using a google search of DXR
• https://bugzilla.mozilla.org/show_bug.cgi?id=1047567
• http://webcompat.com/issues/275

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