--- a/dom/plugins/ipc/PluginModuleParent.cpp
+++ b/dom/plugins/ipc/PluginModuleParent.cpp
@@ -2751,16 +2751,29 @@ PluginModuleParent::NPP_NewInternal(NPMI
     }
 
     // Release the surrogate reference that was in pdata
     RefPtr<PluginAsyncSurrogate> surrogate(
         dont_AddRef(PluginAsyncSurrogate::Cast(instance)));
     // Now replace it with the instance
     instance->pdata = static_cast<PluginDataResolver*>(parentInstance);
 
+    // Any IPC messages for the PluginInstance actor should be dispatched to the
+    // DocGroup for the plugin's document.
+    RefPtr<nsPluginInstanceOwner> owner = parentInstance->GetOwner();
+    nsCOMPtr<nsIDOMElement> elt;
+    owner->GetDOMElement(getter_AddRefs(elt));
+    if (nsCOMPtr<nsINode> node = do_QueryInterface(elt)) {
+        nsCOMPtr<nsIDocument> doc = node->OwnerDoc();
+        if (doc) {
+            nsCOMPtr<nsIEventTarget> eventTarget = doc->EventTargetFor(dom::TaskCategory::Other);
+            SetEventTargetForActor(parentInstance, eventTarget);
+        }
+    }
+
     if (!SendPPluginInstanceConstructor(parentInstance,
                                         nsDependentCString(pluginType), mode,
                                         names, values)) {
         // |parentInstance| is automatically deleted.
         instance->pdata = nullptr;
         *error = NPERR_GENERIC_ERROR;
         return NS_ERROR_FAILURE;
     }