--- a/layout/generic/nsBulletFrame.cpp
+++ b/layout/generic/nsBulletFrame.cpp
@@ -114,17 +114,17 @@ nsBulletFrame::DidSetStyleContext(nsStyl
       if (oldURI && newURI) {
         bool same;
         newURI->Equals(oldURI, &same);
         if (same) {
           needNewRequest = false;
         } else {
           nsLayoutUtils::DeregisterImageRequest(PresContext(), mImageRequest,
                                                 &mRequestRegistered);
-          mImageRequest->Cancel(NS_ERROR_FAILURE);
+          mImageRequest->CancelAndForgetObserver(NS_ERROR_FAILURE);
           mImageRequest = nullptr;
         }
       }
     }
 
     if (needNewRequest) {
       newRequest->Clone(mListener, getter_AddRefs(mImageRequest));
       if (mImageRequest) {
@@ -134,17 +134,17 @@ nsBulletFrame::DidSetStyleContext(nsStyl
       }
     }
   } else {
     // No image request on the new style context
     if (mImageRequest) {
       nsLayoutUtils::DeregisterImageRequest(PresContext(), mImageRequest,
                                             &mRequestRegistered);
 
-      mImageRequest->Cancel(NS_ERROR_FAILURE);
+      mImageRequest->CancelAndForgetObserver(NS_ERROR_FAILURE);
       mImageRequest = nullptr;
     }
   }
 
 #ifdef ACCESSIBILITY
   // Update the list bullet accessible. If old style list isn't available then
   // no need to update the accessible tree because it's not created yet.
   if (aOldStyleContext) {