--- a/dom/media/MediaFormatReader.cpp
+++ b/dom/media/MediaFormatReader.cpp
@@ -1093,19 +1093,19 @@ MediaFormatReader::DemuxerProxy::NotifyD
   });
 }
 
 MediaFormatReader::MediaFormatReader(AbstractMediaDecoder* aDecoder,
                                      MediaDataDemuxer* aDemuxer,
                                      VideoFrameContainer* aVideoFrameContainer)
   : MediaDecoderReader(aDecoder)
   , mAudio(this, MediaData::AUDIO_DATA,
-           Preferences::GetUint("media.audio-max-decode-error", 3))
+           MediaPrefs::MaxAudioDecodeError())
   , mVideo(this, MediaData::VIDEO_DATA,
-           Preferences::GetUint("media.video-max-decode-error", 2))
+           MediaPrefs::MaxVideoDecodeError())
   , mDemuxer(new DemuxerProxy(aDemuxer))
   , mDemuxerInitDone(false)
   , mPendingNotifyDataArrived(false)
   , mLastReportedNumDecodedFrames(0)
   , mPreviousDecodedKeyframeTime_us(sNoPreviousDecodedKeyframe)
   , mInitDone(false)
   , mTrackDemuxersMayBlock(false)
   , mSeekScheduled(false)

--- a/dom/media/MediaPrefs.h
+++ b/dom/media/MediaPrefs.h
@@ -160,16 +160,25 @@ private:
   DECL_MEDIA_PREF("media.webspeech.test.fake_fsm_events",     WebSpeechFakeFSMEvents, bool, false);
   DECL_MEDIA_PREF(TEST_PREFERENCE_FAKE_RECOGNITION_SERVICE,   WebSpeechFakeRecognitionService, bool, false);
   DECL_MEDIA_PREF("media.webspeech.recognition.enable",       WebSpeechRecognitionEnabled, bool, false);
   DECL_MEDIA_PREF("media.webspeech.recognition.force_enable", WebSpeechRecognitionForceEnabled, bool, false);
 
   DECL_MEDIA_PREF("media.num-decode-threads",                 MediaThreadPoolDefaultCount, uint32_t, 4);
   DECL_MEDIA_PREF("media.decoder.limit",                      MediaDecoderLimit, int32_t, MediaDecoderLimitDefault());
 
+#if defined(RELEASE_OR_BETA)
+  DECL_MEDIA_PREF("media.audio-max-decode-error",             MaxAudioDecodeError, uint32_t, 3);
+  DECL_MEDIA_PREF("media.video-max-decode-error",             MaxVideoDecodeError, uint32_t, 2);
+#else
+  // Take zero tolerance of decoding error in debug for any decoder regression.
+  DECL_MEDIA_PREF("media.audio-max-decode-error",             MaxAudioDecodeError, uint32_t, 0);
+  DECL_MEDIA_PREF("media.video-max-decode-error",             MaxVideoDecodeError, uint32_t, 0);
+#endif
+
   // Ogg
   DECL_MEDIA_PREF("media.ogg.enabled",                        OggEnabled, bool, true);
   // Flac
   DECL_MEDIA_PREF("media.ogg.flac.enabled",                   FlacInOgg, bool, false);
   DECL_MEDIA_PREF("media.flac.enabled",                       FlacEnabled, bool, true);
 
 #if !defined(RELEASE_OR_BETA)
   DECL_MEDIA_PREF("media.rust.test_mode",                     RustTestMode, bool, false);

--- a/dom/media/mediasource/test/mediasource.js
+++ b/dom/media/mediasource/test/mediasource.js
@@ -1,12 +1,14 @@
 // Helpers for Media Source Extensions tests
 
 var gMSETestPrefs = [
-  [ "media.mediasource.enabled", true ]
+  [ "media.mediasource.enabled", true ],
+  ['media.audio-max-decode-error', 0],
+  ['media.video-max-decode-error', 0],
 ];
 
 // Called before runWithMSE() to set the prefs before running MSE tests.
 function addMSEPrefs(...prefs) {
   gMSETestPrefs = gMSETestPrefs.concat(prefs);
 }
 
 function runWithMSE(testFunction) {

--- a/dom/media/test/manifest.js
+++ b/dom/media/test/manifest.js
@@ -1588,16 +1588,18 @@ function Log(token, msg) {
 
 // Number of tests to run in parallel.
 var PARALLEL_TESTS = 2;
 
 // Prefs to set before running tests.  Use this to improve coverage of
 // conditions that might not otherwise be encountered on the test data.
 var gTestPrefs = [
   ['media.recorder.max_memory', 1024],
+  ['media.audio-max-decode-error', 0],
+  ['media.video-max-decode-error', 0],
 ];
 
 // When true, we'll loop forever on whatever test we run. Use this to debug
 // intermittent test failures.
 const DEBUG_TEST_LOOP_FOREVER = false;
 
 // Manages a run of media tests. Runs them in chunks in order to limit
 // the number of media elements/threads running in parallel. This limits peak