diff --git a/dom/base/nsContentUtils.cpp b/dom/base/nsContentUtils.cpp
index 967bcafb5dd..08d1b60c5da 100644
--- a/dom/base/nsContentUtils.cpp
+++ b/dom/base/nsContentUtils.cpp
@@ -242,6 +242,7 @@ bool nsContentUtils::sTrustedFullScreenOnly = true;
 bool nsContentUtils::sFullscreenApiIsContentOnly = false;
 bool nsContentUtils::sIsPerformanceTimingEnabled = false;
 bool nsContentUtils::sIsResourceTimingEnabled = false;
+bool nsContentUtils::sIsUserTimingLoggingEnabled = false;
 bool nsContentUtils::sIsExperimentalAutocompleteEnabled = false;
 bool nsContentUtils::sEncodeDecodeURLHash = false;
 
@@ -515,6 +516,9 @@ nsContentUtils::Init()
   Preferences::AddBoolVarCache(&sIsResourceTimingEnabled,
                                "dom.enable_resource_timing", true);
 
+  Preferences::AddBoolVarCache(&sIsUserTimingLoggingEnabled,
+                               "dom.performance.enable_user_timing_logging", false);
+
   Preferences::AddBoolVarCache(&sIsExperimentalAutocompleteEnabled,
                                "dom.forms.autocomplete.experimental", false);
 
diff --git a/dom/base/nsContentUtils.h b/dom/base/nsContentUtils.h
index 0bb2f9b4fbe..5a016728974 100644
--- a/dom/base/nsContentUtils.h
+++ b/dom/base/nsContentUtils.h
@@ -1880,6 +1880,14 @@ public:
     return sIsPerformanceTimingEnabled;
   }
   
+  /*
+   * Returns true if user timing API should print to console.
+   */
+  static bool IsUserTimingLoggingEnabled()
+  {
+    return sIsUserTimingLoggingEnabled;
+  }
+
   /*
    * Returns true if the performance timing APIs are enabled.
    */
@@ -2360,6 +2368,7 @@ private:
   static uint32_t sHandlingInputTimeout;
   static bool sIsPerformanceTimingEnabled;
   static bool sIsResourceTimingEnabled;
+  static bool sIsUserTimingLoggingEnabled;
   static bool sIsExperimentalAutocompleteEnabled;
   static bool sEncodeDecodeURLHash;
 
diff --git a/dom/base/nsPerformance.cpp b/dom/base/nsPerformance.cpp
index 57f005cad5b..1ecdc487323 100644
--- a/dom/base/nsPerformance.cpp
+++ b/dom/base/nsPerformance.cpp
@@ -22,8 +22,15 @@
 #include "mozilla/dom/PerformanceBinding.h"
 #include "mozilla/dom/PerformanceTimingBinding.h"
 #include "mozilla/dom/PerformanceNavigationBinding.h"
+#include "mozilla/IntegerPrintfMacros.h"
 #include "mozilla/TimeStamp.h"
 
+#ifdef MOZ_WIDGET_GONK
+#define PERFLOG(msg, ...)  __android_log_print(ANDROID_LOG_INFO, "PerformanceTiming", msg, ##__VA_ARGS__)
+#else
+#define PERFLOG(msg, ...) printf_stderr(msg, ##__VA_ARGS__)
+#endif
+
 using namespace mozilla;
 using namespace mozilla::dom;
 
@@ -589,7 +596,7 @@ nsPerformance::AddEntry(nsIHttpChannel* channel,
       initiatorType = NS_LITERAL_STRING("other");
     }
     performanceEntry->SetInitiatorType(initiatorType);
-    InsertPerformanceEntry(performanceEntry);
+    InsertPerformanceEntry(performanceEntry, false);
   }
 }
 
@@ -614,7 +621,8 @@ nsPerformance::PerformanceEntryComparator::LessThan(
 }
 
 void
-nsPerformance::InsertPerformanceEntry(PerformanceEntry* aEntry)
+nsPerformance::InsertPerformanceEntry(PerformanceEntry* aEntry,
+                                      bool aShouldPrint)
 {
   MOZ_ASSERT(aEntry);
   MOZ_ASSERT(mEntries.Length() < mPrimaryBufferSize);
@@ -622,6 +630,21 @@ nsPerformance::InsertPerformanceEntry(PerformanceEntry* aEntry)
     NS_WARNING("Performance Entry buffer size maximum reached!");
     return;
   }
+  if (aShouldPrint && nsContentUtils::IsUserTimingLoggingEnabled()) {
+    nsAutoCString uri;
+    nsresult rv = mWindow->GetDocumentURI()->GetHost(uri);
+    if(NS_FAILED(rv)) {
+      // If we have no URI, just put in "none".
+      uri.AssignLiteral("none");
+    }
+    PERFLOG("Performance Entry: %s|%s|%s|%f|%f|%" PRIu64 "\n",
+            uri.get(),
+            NS_ConvertUTF16toUTF8(aEntry->GetEntryType()).get(),
+            NS_ConvertUTF16toUTF8(aEntry->GetName()).get(),
+            aEntry->StartTime(),
+            aEntry->Duration(),
+            static_cast<uint64_t>(PR_Now() / PR_USEC_PER_MSEC));
+  }
   mEntries.InsertElementSorted(aEntry,
                                PerformanceEntryComparator());
   if (mEntries.Length() == mPrimaryBufferSize) {
@@ -645,7 +668,7 @@ nsPerformance::Mark(const nsAString& aName, ErrorResult& aRv)
   }
   nsRefPtr<PerformanceMark> performanceMark =
     new PerformanceMark(this, aName);
-  InsertPerformanceEntry(performanceMark);
+  InsertPerformanceEntry(performanceMark, true);
 }
 
 void
@@ -722,7 +745,7 @@ nsPerformance::Measure(const nsAString& aName,
   }
   nsRefPtr<PerformanceMeasure> performanceMeasure =
     new PerformanceMeasure(this, aName, startTime, endTime);
-  InsertPerformanceEntry(performanceMeasure);
+  InsertPerformanceEntry(performanceMeasure, true);
 }
 
 void
diff --git a/dom/base/nsPerformance.h b/dom/base/nsPerformance.h
index 22b01538e35..4d79b9e2732 100644
--- a/dom/base/nsPerformance.h
+++ b/dom/base/nsPerformance.h
@@ -353,7 +353,7 @@ private:
   DOMTimeMilliSec GetPerformanceTimingFromString(const nsAString& aTimingName);
   DOMHighResTimeStamp ConvertDOMMilliSecToHighRes(const DOMTimeMilliSec aTime);
   void DispatchBufferFullEvent();
-  void InsertPerformanceEntry(PerformanceEntry* aEntry);
+  void InsertPerformanceEntry(PerformanceEntry* aEntry, bool aShouldPrint);
   void ClearEntries(const mozilla::dom::Optional<nsAString>& aEntryName,
                     const nsAString& aEntryType);
   nsCOMPtr<nsPIDOMWindow> mWindow;
diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index 3bc8a1ab037..ce0d18244fc 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -147,6 +147,9 @@ pref("dom.enable_resource_timing", true);
 // Enable high-resolution timing markers for users
 pref("dom.enable_user_timing", true);
 
+// Enable printing performance marks/measures to log
+pref("dom.performance.enable_user_timing_logging", false);
+
 // Whether the Gamepad API is enabled
 pref("dom.gamepad.enabled", true);
 #ifdef RELEASE_BUILD