--- a/dom/plugins/test/testplugin/nptest.cpp
+++ b/dom/plugins/test/testplugin/nptest.cpp
@@ -1506,21 +1506,23 @@ NPP_GetValue(NPP instance, NPPVariable v
   if (variable == NPPVpluginScriptableNPObject) {
     NPObject* object = instanceData->scriptableObject;
     NPN_RetainObject(object);
     *((NPObject**)value) = object;
     return NPERR_NO_ERROR;
   }
   if (variable == NPPVpluginNeedsXEmbed) {
     // Only relevant for X plugins
-    *(NPBool*)value = instanceData->hasWidget;
+    // use 4-byte writes like some plugins may do
+    *(uint32_t*)value = instanceData->hasWidget;
     return NPERR_NO_ERROR;
   }
   if (variable == NPPVpluginWantsAllNetworkStreams) {
-    *(NPBool*)value = instanceData->wantsAllStreams;
+    // use 4-byte writes like some plugins may do
+    *(uint32_t*)value = instanceData->wantsAllStreams;
     return NPERR_NO_ERROR;
   }
 
   return NPERR_GENERIC_ERROR;
 }
 
 NPError
 NPP_SetValue(NPP instance, NPNVariable variable, void* value)