--- a/dom/media/mediasource/MediaSourceDecoder.cpp
+++ b/dom/media/mediasource/MediaSourceDecoder.cpp
@@ -303,22 +303,22 @@ MediaSourceDecoder::CanPlayThrough()
   auto currentPosition = CurrentPosition();
   if (duration.IsInfinite()) {
     // We can't make an informed decision and just assume that it's a live
     // stream
     return true;
   } else if (duration <= currentPosition) {
     return true;
   }
-  // If we have data up to the mediasource's duration or 30s ahead, we can
+  // If we have data up to the mediasource's duration or 10s ahead, we can
   // assume that we can play without interruption.
   TimeIntervals buffered = GetBuffered();
   buffered.SetFuzz(MediaSourceDemuxer::EOS_FUZZ / 2);
   TimeUnit timeAhead =
-    std::min(duration, currentPosition + TimeUnit::FromSeconds(30));
+    std::min(duration, currentPosition + TimeUnit::FromSeconds(10));
   TimeInterval interval(currentPosition, timeAhead);
   return buffered.ContainsStrict(ClampIntervalToEnd(interval));
 }
 
 TimeInterval
 MediaSourceDecoder::ClampIntervalToEnd(const TimeInterval& aInterval)
 {
   MOZ_ASSERT(NS_IsMainThread());