--- a/image/imgLoader.cpp
+++ b/image/imgLoader.cpp
@@ -1212,16 +1212,22 @@ void imgLoader::GlobalInit()
   sCacheMaxSize = cachesize > 0 ? cachesize : 0;
 
   sMemReporter = new imgMemoryReporter();
   RegisterStrongMemoryReporter(sMemReporter);
   RegisterImagesContentUsedUncompressedDistinguishedAmount(
     imgMemoryReporter::ImagesContentUsedUncompressedDistinguishedAmount);
 }
 
+void imgLoader::ShutdownMemoryReporter()
+{
+  UnregisterImagesContentUsedUncompressedDistinguishedAmount();
+  UnregisterStrongMemoryReporter(sMemReporter);
+}
+
 nsresult
 imgLoader::InitCache()
 {
   nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
   if (!os) {
     return NS_ERROR_FAILURE;
   }
 
@@ -1276,19 +1282,21 @@ imgLoader::Observe(nsISupports* aSubject
              strcmp(aTopic, "chrome-flush-caches") == 0) {
     MinimizeCaches();
     ClearChromeImageCache();
   } else if (strcmp(aTopic, "last-pb-context-exited") == 0) {
     if (mRespectPrivacy) {
       ClearImageCache();
       ClearChromeImageCache();
     }
-  } else if (strcmp(aTopic, "profile-before-change") == 0 ||
-             strcmp(aTopic, "xpcom-shutdown") == 0) {
+  } else if (strcmp(aTopic, "profile-before-change") == 0) {
     mCacheTracker = nullptr;
+  } else if (strcmp(aTopic, "xpcom-shutdown") == 0) {
+    mCacheTracker = nullptr;
+    ShutdownMemoryReporter();
 
   } else {
   // (Nothing else should bring us here)
     MOZ_ASSERT(0, "Invalid topic received");
   }
 
   return NS_OK;
 }

--- a/image/imgLoader.h
+++ b/image/imgLoader.h
@@ -327,16 +327,17 @@ public:
    */
   static bool
   SupportImageWithMimeType(const char* aMimeType,
                            AcceptedMimeTypes aAccept =
                              AcceptedMimeTypes::IMAGES);
 
   static void GlobalInit(); // for use by the factory
   static void Shutdown(); // for use by the factory
+  static void ShutdownMemoryReporter();
 
   nsresult ClearChromeImageCache();
   nsresult ClearImageCache();
   void MinimizeCaches();
 
   nsresult InitCache();
 
   bool RemoveFromCache(const ImageCacheKey& aKey);

--- a/xpcom/base/nsIMemoryReporter.idl
+++ b/xpcom/base/nsIMemoryReporter.idl
@@ -484,16 +484,17 @@ typedef int64_t (*InfallibleAmountFn)();
     nsresult Unregister##name##DistinguishedAmount();
 
 DECL_REGISTER_DISTINGUISHED_AMOUNT(Infallible, JSMainRuntimeGCHeap)
 DECL_REGISTER_DISTINGUISHED_AMOUNT(Infallible, JSMainRuntimeTemporaryPeak)
 DECL_REGISTER_DISTINGUISHED_AMOUNT(Infallible, JSMainRuntimeCompartmentsSystem)
 DECL_REGISTER_DISTINGUISHED_AMOUNT(Infallible, JSMainRuntimeCompartmentsUser)
 
 DECL_REGISTER_DISTINGUISHED_AMOUNT(Infallible, ImagesContentUsedUncompressed)
+DECL_UNREGISTER_DISTINGUISHED_AMOUNT(ImagesContentUsedUncompressed)
 
 DECL_REGISTER_DISTINGUISHED_AMOUNT(Infallible, StorageSQLite)
 DECL_UNREGISTER_DISTINGUISHED_AMOUNT(StorageSQLite)
 
 DECL_REGISTER_DISTINGUISHED_AMOUNT(Infallible, LowMemoryEventsVirtual)
 DECL_REGISTER_DISTINGUISHED_AMOUNT(Infallible, LowMemoryEventsPhysical)
 
 DECL_REGISTER_DISTINGUISHED_AMOUNT(Infallible, GhostWindows)

--- a/xpcom/base/nsMemoryReporterManager.cpp
+++ b/xpcom/base/nsMemoryReporterManager.cpp
@@ -2680,16 +2680,17 @@ UnregisterWeakMemoryReporter(nsIMemoryRe
   }
 
 DEFINE_REGISTER_DISTINGUISHED_AMOUNT(Infallible, JSMainRuntimeGCHeap)
 DEFINE_REGISTER_DISTINGUISHED_AMOUNT(Infallible, JSMainRuntimeTemporaryPeak)
 DEFINE_REGISTER_DISTINGUISHED_AMOUNT(Infallible, JSMainRuntimeCompartmentsSystem)
 DEFINE_REGISTER_DISTINGUISHED_AMOUNT(Infallible, JSMainRuntimeCompartmentsUser)
 
 DEFINE_REGISTER_DISTINGUISHED_AMOUNT(Infallible, ImagesContentUsedUncompressed)
+DEFINE_UNREGISTER_DISTINGUISHED_AMOUNT(ImagesContentUsedUncompressed)
 
 DEFINE_REGISTER_DISTINGUISHED_AMOUNT(Infallible, StorageSQLite)
 DEFINE_UNREGISTER_DISTINGUISHED_AMOUNT(StorageSQLite)
 
 DEFINE_REGISTER_DISTINGUISHED_AMOUNT(Infallible, LowMemoryEventsVirtual)
 DEFINE_REGISTER_DISTINGUISHED_AMOUNT(Infallible, LowMemoryEventsPhysical)
 
 DEFINE_REGISTER_DISTINGUISHED_AMOUNT(Infallible, GhostWindows)