--- a/image/imgLoader.cpp
+++ b/image/imgLoader.cpp
@@ -12,16 +12,17 @@
 #include "NullPrincipal.h"
 
 #include "mozilla/Attributes.h"
 #include "mozilla/ClearOnShutdown.h"
 #include "mozilla/Move.h"
 #include "mozilla/Preferences.h"
 #include "mozilla/ChaosMode.h"
 #include "mozilla/LoadInfo.h"
+#include "mozilla/Telemetry.h"
 
 #include "nsImageModule.h"
 #include "imgRequestProxy.h"
 
 #include "nsCOMPtr.h"
 
 #include "nsContentPolicyUtils.h"
 #include "nsContentUtils.h"
@@ -1353,16 +1354,19 @@ void imgLoader::GlobalInit()
   sCacheTimeWeight = gfxPrefs::ImageCacheTimeWeight() / 1000.0;
   int32_t cachesize = gfxPrefs::ImageCacheSize();
   sCacheMaxSize = cachesize > 0 ? cachesize : 0;
 
   sMemReporter = new imgMemoryReporter();
   RegisterStrongMemoryReporter(sMemReporter);
   RegisterImagesContentUsedUncompressedDistinguishedAmount(
     imgMemoryReporter::ImagesContentUsedUncompressedDistinguishedAmount);
+
+  Telemetry::ScalarSet(Telemetry::ScalarID::IMAGES_WEBP_PROBE_OBSERVED, false);
+  Telemetry::ScalarSet(Telemetry::ScalarID::IMAGES_WEBP_CONTENT_OBSERVED, false);
 }
 
 void imgLoader::ShutdownMemoryReporter()
 {
   UnregisterImagesContentUsedUncompressedDistinguishedAmount();
   UnregisterStrongMemoryReporter(sMemReporter);
 }