diff --git a/dom/canvas/ImageBitmap.cpp b/dom/canvas/ImageBitmap.cpp
index 2db97dd6b2..eba7c5535c 100644
--- a/dom/canvas/ImageBitmap.cpp
+++ b/dom/canvas/ImageBitmap.cpp
@@ -1549,17 +1549,5 @@ ImageBitmap::WriteStructuredClone(JSStructuredCloneWriter* aWriter,
   return true;
 }
 
-/*static*/ bool
-ImageBitmap::ExtensionsEnabled(JSContext* aCx, JSObject*)
-{
-  if (NS_IsMainThread()) {
-    return Preferences::GetBool("canvas.imagebitmap_extensions.enabled");
-  } else {
-    WorkerPrivate* workerPrivate = GetWorkerPrivateFromContext(aCx);
-    MOZ_ASSERT(workerPrivate);
-    return workerPrivate->ImageBitmapExtensionsEnabled();
-  }
-}
-
 } // namespace dom
 } // namespace mozilla
diff --git a/dom/canvas/ImageBitmap.h b/dom/canvas/ImageBitmap.h
index 77fc9e1aa8..ac3377fb0c 100644
--- a/dom/canvas/ImageBitmap.h
+++ b/dom/canvas/ImageBitmap.h
@@ -142,9 +142,6 @@ public:
                        nsTArray<RefPtr<gfx::DataSourceSurface>>& aClonedSurfaces,
                        ImageBitmap* aImageBitmap);
 
-  // Mozilla Extensions
-  static bool ExtensionsEnabled(JSContext* aCx, JSObject* aObj);
-
   friend CreateImageBitmapFromBlob;
   friend CreateImageBitmapFromBlobTask;
   friend CreateImageBitmapFromBlobWorkerTask;
diff --git a/dom/workers/WorkerPrefs.h b/dom/workers/WorkerPrefs.h
index 415435cf06..2fb0d36cfd 100644
--- a/dom/workers/WorkerPrefs.h
+++ b/dom/workers/WorkerPrefs.h
@@ -23,7 +23,6 @@
 #if !(defined(DEBUG) || defined(MOZ_ENABLE_JS_DUMP))
 WORKER_SIMPLE_PREF("browser.dom.window.dump.enabled", DumpEnabled, DUMP)
 #endif
-WORKER_SIMPLE_PREF("canvas.imagebitmap_extensions.enabled", ImageBitmapExtensionsEnabled, IMAGEBITMAP_EXTENSIONS_ENABLED)
 WORKER_SIMPLE_PREF("dom.caches.enabled", DOMCachesEnabled, DOM_CACHES)
 WORKER_SIMPLE_PREF("dom.caches.testing.enabled", DOMCachesTestingEnabled, DOM_CACHES_TESTING)
 WORKER_SIMPLE_PREF("dom.performance.enable_user_timing_logging", PerformanceLoggingEnabled, PERFORMANCE_LOGGING_ENABLED)
diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index f1a7291861..0f6f3df80d 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -852,9 +852,6 @@ pref("canvas.filters.enabled", true);
 pref("canvas.path.enabled", true);
 pref("canvas.capturestream.enabled", true);
 
-// Disable the ImageBitmap-extensions for now.
-pref("canvas.imagebitmap_extensions.enabled", false);
-
 // We want the ability to forcibly disable platform a11y, because
 // some non-a11y-related components attempt to bring it up.  See bug
 // 538530 for details about Windows; we have a pref here that allows it